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A266097
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Number of nX4 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors exactly one smaller than itself.
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1
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5, 36, 161, 929, 4893, 26948, 145274, 790986, 4286644, 23281595, 126318252, 685685972, 3721248548, 20197452145, 109618496442, 594950280201, 3229037349370, 17525382955525, 95117628995827, 516243924279843
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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) +24*a(n-2) +17*a(n-3) -89*a(n-4) -40*a(n-5) +146*a(n-6) +18*a(n-7) -82*a(n-8) -6*a(n-9) -8*a(n-10) +36*a(n-11) -13*a(n-12) +a(n-13) -2*a(n-14) +a(n-15) for n>16
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EXAMPLE
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Some solutions for n=4
..0..0..0..1....0..0..2..1....0..0..2..1....0..0..1..1....0..1..1..0
..1..1..2..0....1..1..0..1....1..1..0..1....1..2..0..1....2..1..0..1
..1..0..0..1....1..0..1..1....2..1..1..1....0..0..2..0....1..0..1..1
..1..1..1..0....1..1..0..0....1..0..0..0....1..1..0..1....1..2..0..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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