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A301659
Number of nX5 0..1 arrays with every element equal to 0, 1 or 4 horizontally or vertically adjacent elements, with upper left element zero.
1
8, 9, 15, 24, 46, 99, 223, 528, 1268, 3085, 7557, 18564, 45712, 112683, 277951, 685904, 1692980, 4179275, 10317757, 25473562, 62893616, 155285391, 383406003, 946650748, 2337341394, 5771057703, 14249158391, 35182226914, 86867560256
OFFSET
1,1
COMMENTS
Column 5 of A301662.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) -a(n-2) +a(n-3) -4*a(n-4) -4*a(n-6) +3*a(n-7) +3*a(n-8) +a(n-9) +a(n-10) -2*a(n-11)
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..1..0..1..0. .1..0..1..0..1. .1..0..1..0..1. .1..0..1..0..1
..1..0..1..0..1. .1..0..1..0..1. .0..1..0..1..0. .1..0..1..0..1
..0..1..1..1..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. .0..1..0..1..0. .1..0..1..0..1
CROSSREFS
Cf. A301662.
Sequence in context: A134334 A351048 A292188 * A265221 A286476 A265732
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 25 2018
STATUS
approved