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A317856 Number of nXn 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
0, 3, 4, 56, 350, 3315, 33238, 517734, 8875636, 219127394, 6925306920 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A317863.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317863.

Sequence in context: A272337 A132678 A166850 * A331725 A067093 A041105

Adjacent sequences:  A317853 A317854 A317855 * A317857 A317858 A317859

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 09 2018

STATUS

approved

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Last modified June 24 06:11 EDT 2021. Contains 345416 sequences. (Running on oeis4.)