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A300348
Number of nX6 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
5, 90, 133, 325, 729, 1371, 3092, 6068, 12638, 26306, 55227, 116124, 244628, 515923, 1089092, 2300375, 4859824, 10269075, 21701677, 45866023, 96942392, 204906286, 433123097, 915543514, 1935335582, 4091114685, 8648362831, 18282350436
OFFSET
1,1
COMMENTS
Column 6 of A300350.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) -8*a(n-2) +4*a(n-3) +a(n-7) -3*a(n-8) +4*a(n-9) -2*a(n-10) +a(n-11) -a(n-12) -a(n-16) +a(n-17) for n>22
EXAMPLE
Some solutions for n=5
..0..0..1..0..0..0. .0..1..0..1..0..1. .0..0..1..0..1..1. .0..0..1..1..0..1
..1..0..1..1..1..0. .0..1..0..1..0..1. .1..0..1..0..0..0. .0..1..0..0..1..0
..1..0..0..0..1..0. .1..0..1..0..1..0. .1..0..1..1..1..0. .1..0..1..1..0..1
..1..1..1..0..1..0. .0..1..0..1..0..1. .1..0..0..0..1..0. .0..1..0..0..1..0
..0..0..1..0..1..1. .0..1..1..0..1..1. .1..1..1..0..1..0. .0..0..1..1..0..0
CROSSREFS
Cf. A300350.
Sequence in context: A167424 A174591 A065197 * A336783 A300433 A300767
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 03 2018
STATUS
approved