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A305588 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero. 1
4, 23, 95, 390, 1626, 6818, 28530, 119266, 498890, 2087148, 8731184, 36525814, 152804412, 639253506, 2674304822, 11187927898, 46804640008, 195807072344, 819158586242, 3426949449364, 14336642689542, 59977347549018 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A305593.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -a(n-2) -3*a(n-3) -29*a(n-4) -14*a(n-5) +22*a(n-6) +95*a(n-7) +40*a(n-8) -70*a(n-9) -84*a(n-10) +13*a(n-11) +57*a(n-12) +4*a(n-13) -28*a(n-14) -26*a(n-15) -8*a(n-16) for n>17

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305593.

Sequence in context: A317120 A220647 A014585 * A317006 A227260 A316871

Adjacent sequences:  A305585 A305586 A305587 * A305589 A305590 A305591

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 05 2018

STATUS

approved

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Last modified January 17 06:12 EST 2022. Contains 350378 sequences. (Running on oeis4.)