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A303451
Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
4, 32, 232, 1696, 12408, 90800, 664512, 4863312, 35593024, 260494592, 1906482784, 13952986432, 102117809280, 747370269248, 5469783650304, 40031741270784, 292980566109568, 2144238781851392, 15693054372112384, 114852859493121280
OFFSET
1,1
COMMENTS
Column 3 of A303456.
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1) -4*a(n-2) -2*a(n-3) -36*a(n-4) -16*a(n-5)
EXAMPLE
Some solutions for n=5
..0..0..0. .0..0..1. .0..1..0. .0..1..1. .0..0..0. .0..0..0. .0..0..1
..1..1..0. .1..0..0. .0..1..1. .1..1..1. .0..1..1. .1..0..1. .1..0..0
..1..0..0. .0..0..1. .1..1..0. .1..0..0. .1..0..1. .1..1..0. .1..1..0
..0..0..1. .0..1..0. .1..1..1. .0..1..1. .0..1..1. .1..0..0. .0..1..0
..0..1..0. .1..1..0. .0..0..0. .0..0..0. .0..1..1. .0..1..1. .0..0..0
CROSSREFS
Cf. A303456.
Sequence in context: A033515 A300799 A303457 * A301438 A331334 A301779
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 24 2018
STATUS
approved