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A301602 Number of nXn 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero. 0
1, 2, 2, 25, 330, 8888, 591585, 83224304, 23865691820, 14092825824108 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A301608.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301608.

Sequence in context: A032084 A306062 A195967 * A120979 A032000 A094347

Adjacent sequences:  A301599 A301600 A301601 * A301603 A301604 A301605

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 24 2018

STATUS

approved

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Last modified June 20 10:13 EDT 2019. Contains 324234 sequences. (Running on oeis4.)