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A302617 Number of nXn 0..1 arrays with every element equal to 0, 1, 2 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
1, 8, 25, 130, 896, 9015, 159831, 5004858, 294788397, 30176400734, 5405230985847, 1752290111920178, 1004963193258165778, 1008871420120253493228, 1799713610080002182624711 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A302623.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302623.

Sequence in context: A069586 A253237 A275151 * A042189 A305680 A316927

Adjacent sequences:  A302614 A302615 A302616 * A302618 A302619 A302620

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 10 2018

STATUS

approved

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Last modified August 10 14:50 EDT 2020. Contains 336381 sequences. (Running on oeis4.)