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A304219 Number of nX6 0..1 arrays with every element unequal to 0, 1, 3 or 8 king-move adjacent elements, with upper left element zero. 1
13, 49, 56, 108, 279, 740, 1628, 3759, 9029, 20849, 48072, 112793, 263016, 610412, 1423125, 3318263, 7722039, 17983738, 41903265, 97586352, 227264234, 529380169, 1233005995, 2871700339, 6688659016, 15578951215, 36284973732, 84512326804 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A304221.

LINKS

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

FORMULA

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

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A304221.

Sequence in context: A080171 A303680 A304131 * A305480 A044115 A044496

Adjacent sequences: A304216 A304217 A304218 * A304220 A304221 A304222

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 08 2018

STATUS

approved

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Last modified December 1 01:13 EST 2022. Contains 358453 sequences. (Running on oeis4.)