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A204355
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Number of (n+2)X4 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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241, 713, 2063, 5812, 16792, 48226, 137407, 391892, 1119476, 3196951, 9126981, 26061757, 74425495, 212515956, 606804945, 1732733907, 4947863676, 14128324624, 40342604370, 115197578608, 328943960511, 939285398798, 2682094110978
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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) = 5*a(n-2) +8*a(n-3) +16*a(n-4) -7*a(n-5) -76*a(n-6) -52*a(n-7) +39*a(n-8) +33*a(n-9) +27*a(n-10) +105*a(n-11) +24*a(n-12) -102*a(n-13) +36*a(n-14) +13*a(n-15) -86*a(n-16) -26*a(n-17) +20*a(n-18) +14*a(n-19) -12*a(n-20) +18*a(n-21) +6*a(n-22) -4*a(n-23) +2*a(n-24) for n>28
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EXAMPLE
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Some solutions for n=3
..0..0..0..0....0..1..0..1....0..0..0..0....0..1..0..0....0..0..1..1
..0..1..1..0....1..1..1..0....0..1..1..0....0..1..1..0....1..1..0..1
..1..0..0..1....1..0..0..1....1..0..1..1....0..0..1..1....1..1..0..1
..1..0..0..1....0..1..1..1....1..1..0..1....1..0..1..0....0..0..1..1
..0..1..1..0....0..0..1..0....0..1..1..0....0..1..0..1....1..1..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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