A260834 - OEIS

A260834

Number of (n+2)X(1+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101

48, 82, 188, 364, 644, 1320, 2584, 4842, 9412, 18210, 35192, 68158, 130812, 253334, 491376, 945170, 1825292, 3533066, 6818232, 13167414, 25439060, 49131310, 94931752, 183337586, 354061772, 684091450, 1321342040, 2551947046, 4929738068

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OFFSET

1,1

COMMENTS

Column 1 of A260841

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 4*a(n-3) +3*a(n-4) +4*a(n-5) +12*a(n-8) +12*a(n-9) -8*a(n-11) -12*a(n-12) -12*a(n-13) -8*a(n-14) for n>15

EXAMPLE

Some solutions for n=4

..0..0..1....1..0..0....0..0..0....0..0..0....0..1..0....1..0..0....0..0..0

..0..0..1....0..1..0....0..0..1....1..0..0....0..0..1....0..0..0....0..0..0

..0..0..0....0..0..0....0..0..0....0..0..0....0..1..0....0..0..0....0..0..1

..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..1..0....0..0..0

..0..0..1....0..1..0....1..1..0....1..0..0....0..0..0....0..0..1....1..0..1

..0..0..1....1..0..0....1..0..0....0..0..0....0..1..0....0..1..0....0..1..0

CROSSREFS

Cf. A260841

Sequence in context: A260841 A260767 A211722 * A260760 A260501 A260494

Adjacent sequences: A260831 A260832 A260833 * A260835 A260836 A260837

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 01 2015

STATUS

approved