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A303716
Number of nX5 0..1 arrays with every element unequal to 0, 1 or 5 king-move adjacent elements, with upper left element zero.
1
8, 7, 14, 36, 81, 169, 361, 784, 1681, 3600, 7744, 16641, 35721, 76729, 164836, 354025, 760384, 1633284, 3508129, 7535025, 16184529, 34762816, 74666881, 160376896, 344473600, 739894401, 1589218225, 3413480625, 7331811876, 15747991081
OFFSET
1,1
COMMENTS
Column 5 of A303719.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +a(n-2) +3*a(n-3) +a(n-4) -a(n-5) -a(n-6) for n>9
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..1..0. .0..1..0..0..0. .0..0..0..0..0
..1..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1
..0..0..0..0..1. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..0..0..0..0. .0..0..0..0..0. .1..0..0..0..1. .0..0..0..0..0
..0..1..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..1..0..0..0
CROSSREFS
Cf. A303719.
Sequence in context: A051011 A298666 A309628 * A309629 A075573 A317706
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 29 2018
STATUS
approved