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A304268
Number of nX6 0..1 arrays with every element unequal to 0, 1, 5 or 8 king-move adjacent elements, with upper left element zero.
1
13, 13, 37, 116, 404, 1246, 3788, 12342, 39252, 122156, 388150, 1234248, 3885916, 12284744, 38942904, 123064868, 388956186, 1231020108, 3893434762, 12310010474, 38938978286, 123164661778, 389498928546, 1231896735244, 3896353516054
OFFSET
1,1
COMMENTS
Column 6 of A304270.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +2*a(n-2) +16*a(n-3) +7*a(n-4) -14*a(n-5) -45*a(n-6) -14*a(n-7) +5*a(n-8) +38*a(n-9) +13*a(n-10) -6*a(n-11) -6*a(n-12) for n>13
EXAMPLE
Some solutions for n=5
..0..0..0..0..0..0. .0..0..0..1..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..1
..0..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..0..0..0..0..0. .0..1..0..0..1..0. .0..0..0..0..0..0
..0..1..0..0..0..0. .0..1..0..0..1..0. .0..0..0..0..0..0. .0..0..0..0..1..0
CROSSREFS
Cf. A304270.
Sequence in context: A022347 A026907 A210475 * A214466 A302678 A147249
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 09 2018
STATUS
approved