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A317261 Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 1
3, 7, 10, 21, 46, 91, 186, 409, 892, 1931, 4236, 9363, 20792, 46525, 104832, 237487, 540898, 1238373, 2848246, 6577977, 15248530, 35464687, 82722630, 193446597, 453383480, 1064658303, 2504274032, 5899032191, 13912945708, 32848848465 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A317266.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) -3*a(n-2) +a(n-3) -12*a(n-4) +11*a(n-5) -6*a(n-6) +20*a(n-7) -17*a(n-8) +20*a(n-9) +a(n-10) +7*a(n-11) -30*a(n-12) -11*a(n-13) -8*a(n-14) +8*a(n-15) +8*a(n-16)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317266.

Sequence in context: A279912 A305477 A316306 * A024464 A127277 A302704

Adjacent sequences:  A317258 A317259 A317260 * A317262 A317263 A317264

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 25 2018

STATUS

approved

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Last modified January 25 06:44 EST 2022. Contains 350565 sequences. (Running on oeis4.)