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A318539 Number of n X n 0..1 arrays with every element unequal to 0, 1, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
1, 1, 6, 31, 247, 2905, 46165, 1143583, 41368803, 2165406865, 168220637918, 19176703676628, 3204799103321623, 788247777299643666, 284810105663632654341, 151134158955831615046217 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A318545.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..21

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A318545.

Sequence in context: A244255 A299550 A208594 * A221514 A144576 A120107

Adjacent sequences:  A318536 A318537 A318538 * A318540 A318541 A318542

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 28 2018

STATUS

approved

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Last modified May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)