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A302077
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Number of nX4 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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5, 18, 70, 265, 1018, 3914, 15017, 57850, 222146, 855385, 3287398, 12651474, 48644813, 187150738, 719753422, 2768709321, 10649029682, 40961783594, 157553086817, 606019586218, 2330988115930, 8965959828713, 34486717807054
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OFFSET
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1,1
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COMMENTS
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Column 4 of A302081.
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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) = a(n-1) +14*a(n-2) -a(n-3) -42*a(n-4) -a(n-5) +14*a(n-6) +a(n-7) -a(n-8)
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EXAMPLE
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Some solutions for n=5
..0..1..0..1. .0..1..0..1. .0..1..0..1. .0..1..0..1. .0..0..1..0
..1..0..0..1. .1..0..1..0. .1..0..0..1. .0..0..0..0. .1..1..0..0
..0..1..1..1. .1..0..1..0. .0..1..0..1. .1..0..1..0. .1..0..1..0
..0..0..0..1. .1..1..1..0. .0..0..0..1. .1..1..1..0. .1..0..1..0
..0..1..0..1. .0..0..1..1. .1..1..0..1. .1..0..1..1. .1..0..1..1
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CROSSREFS
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Cf. A302081.
Sequence in context: A134764 A188177 A343490 * A322773 A145780 A183443
Adjacent sequences: A302074 A302075 A302076 * A302078 A302079 A302080
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Mar 31 2018
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STATUS
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approved
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