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A303098
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Number of n X 4 0..1 arrays with every element equal to 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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1
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2, 46, 431, 4667, 49534, 523578, 5550469, 58797885, 622939052, 6599795867, 69921718286, 740789814624, 7848336732510, 83149623160674, 880933142617394, 9333093335046307, 98879957242770978, 1047589002709557389
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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) = 9*a(n-1) +26*a(n-2) -57*a(n-3) -433*a(n-4) -47*a(n-5) +1932*a(n-6) +2731*a(n-7) -3490*a(n-8) -6960*a(n-9) +156*a(n-10) +748*a(n-11) +3388*a(n-12) +5000*a(n-13) +12879*a(n-14) +2488*a(n-15) -9412*a(n-16) -11225*a(n-17) -870*a(n-18) -5309*a(n-19) +3368*a(n-20) -2123*a(n-21) +1230*a(n-22) -349*a(n-23) +121*a(n-24) +28*a(n-25) -26*a(n-26).
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EXAMPLE
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Some solutions for n=5
..0..0..1..0. .0..1..1..1. .0..0..1..1. .0..1..1..1. .0..0..0..0
..0..1..0..0. .1..0..0..1. .1..1..0..0. .0..0..1..0. .0..1..0..0
..1..0..1..1. .1..1..0..0. .1..0..0..1. .1..1..0..1. .1..1..0..0
..1..1..0..1. .0..0..0..1. .1..0..1..0. .1..0..0..1. .0..1..1..0
..1..1..0..0. .1..1..1..1. .1..1..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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