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A302004
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Number of 7Xn 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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0, 233, 499, 1394, 110036, 729297, 15243860, 204666568, 2933712940, 44201068772, 631467436258, 9310616032492, 135219892970154, 1977188363830961, 28827781254085548, 420748594948205104, 6138969205830064789
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OFFSET
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1,2
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COMMENTS
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Row 7 of A301999.
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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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EXAMPLE
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Some solutions for n=5
..0..0..1..1..0. .0..0..1..1..0. .0..0..0..0..1. .0..0..0..1..1
..0..1..0..0..0. .0..0..0..0..0. .1..1..1..1..1. .1..1..1..0..0
..1..1..0..1..1. .1..1..0..1..1. .0..0..1..0..0. .0..0..1..1..0
..1..0..1..1..1. .1..1..0..0..1. .0..1..1..0..1. .0..0..1..0..1
..0..0..1..0..0. .0..0..0..1..1. .0..0..0..1..1. .0..0..0..1..1
..1..1..1..1..1. .0..1..0..1..1. .1..1..0..1..1. .1..1..0..0..0
..1..0..0..0..0. .1..0..0..0..0. .1..0..0..0..0. .1..0..1..1..1
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CROSSREFS
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Cf. A301999.
Sequence in context: A154621 A243891 A142644 * A308786 A097447 A142783
Adjacent sequences: A302001 A302002 A302003 * A302005 A302006 A302007
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Mar 30 2018
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STATUS
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approved
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