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A303423
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Number of 4Xn 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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1
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8, 128, 1988, 30897, 480953, 7486281, 116517744, 1813509273, 28226012078, 439318146284, 6837678112091, 106423655020443, 1656409429611799, 25780849141739720, 401260805513420875, 6245342547417157374
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OFFSET
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1,1
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COMMENTS
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Row 4 of A303421.
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 14*a(n-1) +12*a(n-2) +175*a(n-3) +283*a(n-4) -235*a(n-5) -144*a(n-6) +67*a(n-7) -135*a(n-8) +50*a(n-9)
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EXAMPLE
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Some solutions for n=5
..0..0..0..0..1. .0..0..0..1..0. .0..1..0..1..1. .0..0..0..1..1
..0..0..0..0..0. .0..1..1..0..0. .0..0..1..1..1. .0..0..0..0..1
..0..1..1..0..1. .0..1..0..0..1. .0..1..1..1..0. .0..0..1..1..1
..0..0..1..1..1. .0..0..0..1..1. .1..0..1..1..1. .0..0..0..1..0
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CROSSREFS
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Cf. A303421.
Sequence in context: A300204 A213414 A303417 * A301403 A317513 A300178
Adjacent sequences: A303420 A303421 A303422 * A303424 A303425 A303426
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Apr 23 2018
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STATUS
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approved
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