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A317120 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero. 1
4, 23, 82, 302, 1164, 4561, 17966, 70913, 280153, 1107258, 4377083, 17304434, 68414244, 270485001, 1069407613, 4228096809, 16716574533, 66092165685, 261308072698, 1033131823544, 4084686061176, 16149595233372, 63850544759048 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A317125.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +2*a(n-2) -4*a(n-3) -19*a(n-4) -3*a(n-5) +20*a(n-6) +11*a(n-7) -8*a(n-8) +19*a(n-9) +19*a(n-10) -10*a(n-11) -21*a(n-12) -9*a(n-13) +2*a(n-14) -14*a(n-15) -8*a(n-16)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317125.

Sequence in context: A316204 A305771 A219465 * A220647 A014585 A305588

Adjacent sequences:  A317117 A317118 A317119 * A317121 A317122 A317123

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 21 2018

STATUS

approved

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Last modified October 25 17:22 EDT 2021. Contains 348255 sequences. (Running on oeis4.)