A317816 - OEIS

A317816

Number of nXn 0..1 arrays with every element unequal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 5, 35, 702, 8556, 296968, 7370716, 384248160, 21424520640, 1842317433367, 222676829507057, 36099873530494859, 9133843424563202164

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OFFSET

1,2

COMMENTS

Diagonal of A317823.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317823.

Sequence in context: A089043 A317995 A260075 * A034236 A058015 A053420

Adjacent sequences: A317813 A317814 A317815 * A317817 A317818 A317819

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 07 2018

STATUS

approved