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A304762
Number of nX3 0..1 arrays with every element unequal to 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.
2
0, 5, 16, 103, 609, 3680, 22187, 133917, 808316, 4879291, 29453651, 177797086, 1073274929, 6478847051, 39109708948, 236086679225, 1425142852937, 8602908821882, 51931664514329, 313486733315663, 1892370154813176
OFFSET
1,2
COMMENTS
Column 3 of A304767.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) +8*a(n-2) -a(n-3) -51*a(n-4) -45*a(n-5) +30*a(n-6) +33*a(n-7) +7*a(n-8) -13*a(n-9) -2*a(n-10) +5*a(n-11) +8*a(n-12) +2*a(n-13) for n>15
EXAMPLE
Some solutions for n=5
..0..1..0. .0..1..0. .0..1..1. .0..0..0. .0..1..0. .0..1..0. .0..1..0
..1..1..1. .1..1..0. .1..0..0. .1..1..1. .0..1..0. .0..1..0. .0..1..1
..0..1..0. .1..0..1. .0..0..1. .1..0..0. .0..1..0. .0..1..0. .1..0..1
..0..1..0. .0..0..0. .1..1..1. .0..1..0. .0..1..0. .1..0..1. .0..0..1
..1..0..1. .1..0..1. .0..0..0. .1..0..1. .1..0..1. .0..1..0. .1..0..1
CROSSREFS
Cf. A304767.
Sequence in context: A196015 A332625 A307953 * A317460 A341436 A263906
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 18 2018
STATUS
approved