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A317217 Number of nX3 0..1 arrays with every element unequal to 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero. 2
1, 25, 133, 929, 6134, 40873, 272012, 1810626, 12051365, 80215518, 533919483, 3553810073, 23654434010, 157445726657, 1047970872960, 6975374721128, 46428630555399, 309032535648912, 2056944323309905, 13691179605401845 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A317222.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 4*a(n-1) +18*a(n-2) +12*a(n-3) -68*a(n-4) -154*a(n-5) -120*a(n-6) -66*a(n-7) -43*a(n-8) -12*a(n-9) for n>10

EXAMPLE

Some solutions for n=5

..0..0..1. .0..1..1. .0..1..0. .0..0..1. .0..1..0. .0..0..0. .0..1..0

..1..1..0. .0..0..1. .1..1..0. .0..1..0. .0..0..1. .1..1..0. .0..0..0

..0..1..1. .0..0..1. .1..1..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0

..0..1..1. .1..1..1. .1..0..1. .0..0..0. .1..1..1. .0..1..0. .1..1..0

..0..0..0. .1..0..0. .1..1..1. .1..1..0. .1..0..0. .0..0..1. .1..0..1

CROSSREFS

Cf. A317222.

Sequence in context: A232856 A232792 A305956 * A147489 A156158 A195977

Adjacent sequences:  A317214 A317215 A317216 * A317218 A317219 A317220

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 23 2018

STATUS

approved

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Last modified July 4 16:24 EDT 2020. Contains 335448 sequences. (Running on oeis4.)