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A256804
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Number of (n+2)X(2+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 and no antidiagonal sum 0 and no row sum 0 or 1 and no column sum 0 or 1
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1
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86, 312, 1167, 4219, 15291, 55798, 203129, 738760, 2689072, 9788263, 35621557, 129642381, 471844124, 1717266695, 6249942014, 22746670844, 82786372499, 301300009747, 1096578905535, 3990990415282, 14525173993491, 52864244476540
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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) +4*a(n-2) +17*a(n-3) +18*a(n-4) -7*a(n-5) -37*a(n-6) -47*a(n-7) +2*a(n-8) +40*a(n-9) +21*a(n-10) -7*a(n-11) -3*a(n-12) -2*a(n-13) -a(n-14)
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EXAMPLE
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Some solutions for n=4
..1..0..1..1....0..1..1..1....1..1..1..1....0..1..1..1....1..1..1..0
..1..1..1..1....1..1..0..1....1..1..1..1....1..1..1..1....1..1..1..1
..0..1..1..1....1..1..1..1....1..1..1..0....1..1..0..1....1..1..1..1
..1..1..1..0....0..1..1..1....1..1..0..1....1..1..1..1....1..1..0..1
..1..1..1..1....1..1..1..0....1..1..1..1....1..1..1..1....1..1..1..0
..1..1..1..1....1..1..0..1....1..0..1..1....1..1..1..0....1..0..1..1
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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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