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A297811 Number of nX5 0..1 arrays with every element equal to 2 or 3 king-move adjacent elements, with upper left element zero. 1
0, 8, 0, 13, 24, 41, 39, 109, 216, 471, 883, 1826, 3771, 7957, 16180, 33265, 68409, 141908, 292327, 602447, 1240608, 2561035, 5282041, 10893334, 22455433, 46313241, 95513864, 196987195, 406204281, 837692722, 1727540167, 3562722575, 7347181938 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 5 of A297814.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +a(n-2) -2*a(n-3) +4*a(n-4) -4*a(n-5) -8*a(n-6) -a(n-7) +5*a(n-8) +a(n-9) +4*a(n-10) +a(n-11) -3*a(n-12) for n>21
EXAMPLE
Some solutions for n=7
..0..0..1..1..1. .0..0..0..1..1. .0..0..1..0..0. .0..0..0..0..0
..0..1..0..0..1. .0..1..1..0..1. .0..1..0..1..0. .0..1..1..1..0
..0..1..0..1..0. .1..0..0..0..1. .0..1..0..1..0. .1..0..0..0..1
..0..1..0..1..0. .0..1..1..1..0. .1..0..1..0..1. .0..1..1..1..0
..0..1..0..1..0. .1..0..0..0..1. .1..0..1..0..1. .1..0..0..0..1
..1..0..0..1..0. .0..1..1..0..1. .0..1..1..0..1. .0..1..1..1..0
..1..1..1..0..0. .0..0..0..1..1. .0..0..0..1..1. .0..0..0..0..0
CROSSREFS
Cf. A297814.
Sequence in context: A112268 A077062 A189764 * A359686 A325318 A255680
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2018
STATUS
approved

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)