A317889 - OEIS

A317889

Number of nXn 0..1 arrays with every element unequal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 4, 82, 6193, 1184196, 580702029, 736219004144, 2388442704194600, 19885239768168130210

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OFFSET

1,3

COMMENTS

Diagonal of A317896.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317896.

Sequence in context: A318868 A289224 A158981 * A291371 A007154 A056410

Adjacent sequences: A317886 A317887 A317888 * A317890 A317891 A317892

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 10 2018

STATUS

approved