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A303724 Number of nX5 0..1 arrays with every element unequal to 0, 1, 2 or 3 king-move adjacent elements, with upper left element zero. 1
16, 120, 77, 133, 219, 345, 564, 974, 1715, 2992, 5222, 9175, 16164, 28488, 50193, 88452, 155956, 275011, 484934, 855114, 1507919, 2659158, 4689360, 8269543, 14583134, 25717084, 45351643, 79976894, 141037974, 248718277, 438610954 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A303727.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) -a(n-4) -a(n-6) -a(n-7) +2*a(n-8) for n>12
EXAMPLE
Some solutions for n=5
..0..0..0..0..1. .0..1..1..1..1. .0..1..1..1..1. .0..0..0..1..0
..0..0..0..0..0. .0..1..1..1..1. .1..1..1..1..1. .0..0..1..1..1
..0..0..0..0..0. .0..1..1..1..1. .1..1..1..1..0. .0..1..1..1..1
..1..0..0..0..1. .0..1..1..1..1. .1..1..1..0..0. .1..1..1..1..1
..1..1..0..1..1. .0..1..1..1..1. .0..1..0..0..0. .0..1..1..1..0
CROSSREFS
Cf. A303727.
Sequence in context: A210428 A283037 A093740 * A305227 A304772 A316515
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 29 2018
STATUS
approved

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Last modified March 29 08:47 EDT 2024. Contains 371267 sequences. (Running on oeis4.)