A252201 - OEIS

A252201

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7

441, 585, 585, 970, 470, 970, 1642, 669, 669, 1642, 2931, 1313, 1647, 1313, 2931, 5316, 3201, 5177, 5177, 3201, 5316, 10074, 8526, 17541, 21928, 17541, 8526, 10074, 19529, 23265, 60325, 92287, 92287, 60325, 23265, 19529, 38353, 63626, 206825, 391996

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OFFSET

1,1

COMMENTS

Table starts

...441....585.....970......1642.......2931........5316........10074

...585....470.....669......1313.......3201........8526........23265

...970....669....1647......5177......17541.......60325.......206825

..1642...1313....5177.....21928......92287......391996......1669356

..2931...3201...17541.....92287.....480526.....2547827.....13460703

..5316...8526...60325....391996....2547827....16789626....110131575

.10074..23265..206825...1669356...13460703...110131575....896763106

.19529..63626..711829...7114929...71027985...722619095...7301549086

.38353.174878.2455121..30309104..375675407..4749948439..59570598688

.76314.481751.8451245.129016093.1985308118.31181555268.485457428350

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..420

FORMULA

Empirical for column k:

k=1: [linear recurrence of order 49] for n>56

k=2: [order 16] for n>21

k=3: [order 18] for n>23

k=4: [order 24] for n>28

k=5: [order 44] for n>47

k=6: [order 72] for n>75

EXAMPLE

Some solutions for n=4 k=4

..2..3..3..3..3..2....3..3..3..3..3..3....3..3..3..3..3..2....3..3..3..3..3..3

..3..3..3..3..3..3....3..2..3..3..3..3....3..3..3..2..3..3....2..3..3..3..3..3

..3..2..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3....3..3..2..3..3..3

..3..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3

..3..3..2..3..3..2....3..3..3..3..2..3....3..3..2..3..3..3....3..3..3..2..3..3

..2..3..3..3..2..3....3..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3

CROSSREFS

Sequence in context: A252193 A207650 A207045 * A252194 A057949 A057950

Adjacent sequences: A252198 A252199 A252200 * A252202 A252203 A252204

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Dec 15 2014

STATUS

approved