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A317460
Number of nX3 0..1 arrays with every element unequal to 2, 3, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
1
0, 5, 16, 107, 636, 3893, 23769, 145280, 887980, 5428139, 33181694, 202838254, 1239944574, 7579749355, 46334824959, 283243696481, 1731462085879, 10584387302544, 64702112676461, 395522505704920, 2417819853246711
OFFSET
1,2
COMMENTS
Column 3 of A317465.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) +8*a(n-2) +2*a(n-3) -48*a(n-4) -62*a(n-5) +35*a(n-6) +62*a(n-7) +5*a(n-8) -25*a(n-9) +2*a(n-10) +14*a(n-11) +4*a(n-12) for n>14
EXAMPLE
Some solutions for n=5
..0..0..0. .0..0..1. .0..0..0. .0..1..0. .0..1..0. .0..1..0. .0..0..1
..1..1..1. .1..1..0. .1..1..1. .1..1..0. .1..1..0. .1..1..0. .1..1..0
..1..0..1. .0..0..0. .0..1..0. .0..1..0. .0..1..0. .0..1..0. .0..1..1
..1..0..0. .0..1..0. .1..1..1. .1..0..0. .0..1..1. .1..1..0. .1..0..1
..0..1..1. .1..0..1. .0..1..0. .1..0..1. .1..0..0. .0..0..1. .0..1..0
CROSSREFS
Cf. A317465.
Sequence in context: A332625 A307953 A304762 * A341436 A263906 A160739
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 28 2018
STATUS
approved