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A204356
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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
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1
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764, 2063, 5516, 13721, 35690, 92286, 236382, 607036, 1562386, 4024090, 10362274, 26670982, 68640970, 176707668, 454941820, 1171126358, 3014574254, 7760190950, 19977148404, 51426366674, 132382169446, 340781628584, 877258120820
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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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
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EXAMPLE
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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
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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