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A305227 Number of nX5 0..1 arrays with every element unequal to 0, 1, 2, 3 or 8 king-move adjacent elements, with upper left element zero. 1
16, 120, 108, 253, 757, 2050, 5958, 17002, 49275, 142734, 414039, 1202260, 3491206, 10141687, 29461836, 85594654, 248682102, 722521492, 2099237868, 6099225999, 17721044395, 51487829975, 149596113978, 434646575675, 1262851676336 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A305230.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) -a(n-2) -7*a(n-3) +5*a(n-5) +7*a(n-7) -4*a(n-8) -3*a(n-9) -a(n-10) +a(n-12) for n>16
EXAMPLE
Some solutions for n=5
..0..0..0..0..1. .0..0..0..0..1. .0..1..1..1..0. .0..0..0..0..0
..0..0..1..0..0. .0..1..0..0..0. .1..1..1..0..0. .0..0..0..0..0
..0..0..0..0..0. .0..0..0..0..1. .1..1..0..0..0. .0..0..0..0..0
..1..0..0..1..0. .0..0..0..1..1. .1..0..0..0..1. .0..1..0..1..0
..1..1..0..0..0. .1..0..1..1..1. .0..0..0..1..1. .0..0..0..0..0
CROSSREFS
Cf. A305230.
Sequence in context: A283037 A093740 A303724 * A304772 A316515 A304469
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 27 2018
STATUS
approved

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Last modified June 17 09:58 EDT 2024. Contains 373444 sequences. (Running on oeis4.)