A227268 - OEIS

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A227268

Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of three or less, with rows and columns of the latter in lexicographically nondecreasing order

1

6, 54, 341, 1949, 10906, 59952, 311644, 1513042, 6877791, 29429777, 119153363, 458571762, 1684448300, 5926680882, 20037283285, 65276341407, 205423183265, 625887083947, 1850014507021, 5314738730828, 14864035315827, 40531623551553

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 5 of A227269

LINKS

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

R. H. Hardin, Empirical polynomial of degree 39

FORMULA

Empirical polynomial of degree 39 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A367662 A355054 A116138 * A364008 A300583 A060774

Adjacent sequences: A227265 A227266 A227267 * A227269 A227270 A227271

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 04 2013

STATUS

approved