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A302513
Number of nX6 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
13, 13, 52, 80, 199, 458, 1088, 2651, 6257, 14765, 35292, 84261, 200040, 475278, 1132373, 2696179, 6411133, 15251746, 36304757, 86394322, 205538228, 489069395, 1163851093, 2769397039, 6589505584, 15679835445, 37311095302, 88781699786
OFFSET
1,1
COMMENTS
Column 6 of A302515.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +6*a(n-3) +5*a(n-4) +3*a(n-5) -8*a(n-6) -6*a(n-7) -3*a(n-8) for n>12
EXAMPLE
Some solutions for n=5
..0..1..0..1..0..1. .0..1..0..1..0..1. .0..1..0..1..1..1. .0..1..0..1..0..1
..0..1..1..1..0..1. .0..1..0..1..0..1. .0..1..0..1..0..1. .0..1..1..1..0..1
..0..0..0..1..0..1. .0..1..1..1..0..1. .0..1..0..1..0..1. .0..1..0..0..0..1
..0..1..0..1..0..1. .0..1..0..0..0..1. .0..1..0..1..0..1. .0..1..0..1..0..1
..0..1..0..1..0..1. .0..1..0..1..0..1. .0..1..0..0..0..1. .0..1..0..1..0..1
CROSSREFS
Cf. A302515.
Sequence in context: A302678 A147249 A321654 * A147013 A147187 A147069
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2018
STATUS
approved