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A305085
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Number of nX4 0..1 arrays with every element unequal to 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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2, 33, 34, 91, 352, 372, 1016, 3474, 4945, 13288, 37062, 64155, 165994, 415987, 812826, 2026972, 4818456, 10116447, 24515337, 56876113, 124413665, 295467341, 678580178, 1518490899, 3558083669, 8143158484, 18447074191, 42855072254
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OFFSET
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1,1
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COMMENTS
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Column 4 of A305089.
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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) = 3*a(n-1) +6*a(n-3) -31*a(n-4) +6*a(n-5) +10*a(n-6) +73*a(n-7) -15*a(n-8) -70*a(n-9) -42*a(n-10) -6*a(n-11) +63*a(n-12) +32*a(n-13) +12*a(n-14) -25*a(n-15) -20*a(n-16) -3*a(n-17) +4*a(n-18) +4*a(n-19) for n>24
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EXAMPLE
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Some solutions for n=5
..0..1..1..0. .0..0..1..1. .0..1..1..0. .0..0..1..0. .0..1..1..0
..1..0..0..1. .1..1..0..1. .1..0..0..1. .1..0..1..1. .1..1..0..1
..1..1..1..1. .1..1..1..1. .1..1..1..1. .1..1..1..1. .1..1..1..1
..1..0..1..1. .1..0..1..1. .1..0..1..1. .1..0..0..1. .0..0..1..1
..1..1..0..0. .0..1..1..0. .0..1..1..0. .1..1..0..1. .0..1..1..0
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CROSSREFS
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Cf. A305089.
Sequence in context: A304145 A305485 A078732 * A042251 A316736 A199551
Adjacent sequences: A305082 A305083 A305084 * A305086 A305087 A305088
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, May 25 2018
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STATUS
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approved
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