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A303891 Number of nX3 0..1 arrays with every element unequal to 1, 2, 3 or 4 king-move adjacent elements, with upper left element zero. 1
1, 23, 54, 271, 842, 3420, 11916, 45404, 163979, 611654, 2237701, 8282518, 30442766, 112364696, 413696068, 1525420791, 5619579530, 20713550451, 76324380196, 281291917100, 1036573413060, 3820089888616, 14077601589105, 51879385009658 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A303896.

LINKS

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

FORMULA

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303896.

Sequence in context: A103006 A053236 A118603 * A264117 A033657 A305283

Adjacent sequences:  A303888 A303889 A303890 * A303892 A303893 A303894

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 02 2018

STATUS

approved

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Last modified August 11 00:55 EDT 2022. Contains 356046 sequences. (Running on oeis4.)