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A316871 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero. 1
4, 23, 99, 425, 1877, 8333, 36900, 163433, 724406, 3210961, 14232174, 63085590, 279639102, 1239553378, 5494572826, 24355881186, 107962769031, 478568720832, 2121361756337, 9403406620066, 41682688016275, 184767777113249 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A316876.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -a(n-2) +2*a(n-3) -36*a(n-4) -22*a(n-5) +16*a(n-6) +131*a(n-7) +27*a(n-8) -72*a(n-9) -71*a(n-10) +21*a(n-11) +16*a(n-12) -15*a(n-13) -10*a(n-14) -18*a(n-15) -8*a(n-16) for n>17

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A316876.

Sequence in context: A305588 A317006 A227260 * A197854 A317599 A122738

Adjacent sequences:  A316868 A316869 A316870 * A316872 A316873 A316874

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 15 2018

STATUS

approved

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Last modified November 28 08:12 EST 2021. Contains 349401 sequences. (Running on oeis4.)