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A204356 Number of (n+2)X5 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly one way, and new values 0..1 introduced in row major order 1
764, 2063, 5516, 13721, 35690, 92286, 236382, 607036, 1562386, 4024090, 10362274, 26670982, 68640970, 176707668, 454941820, 1171126358, 3014574254, 7760190950, 19977148404, 51426366674, 132382169446, 340781628584, 877258120820 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A204361

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +2*a(n-3) +17*a(n-4) -a(n-5) -a(n-6) -5*a(n-7) -58*a(n-8) +28*a(n-9) -9*a(n-10) -11*a(n-11) +84*a(n-12) -82*a(n-13) +49*a(n-14) +a(n-15) -50*a(n-16) +66*a(n-17) -52*a(n-18) +33*a(n-19) -12*a(n-20) +4*a(n-21) -4*a(n-23) for n>29

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A084072 A049534 A245007 * A238920 A054468 A156395

Adjacent sequences:  A204353 A204354 A204355 * A204357 A204358 A204359

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 14 2012

STATUS

approved

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Last modified August 3 06:22 EDT 2021. Contains 346435 sequences. (Running on oeis4.)