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A300459 Number of nXn 0..1 arrays with every element equal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
0, 1, 2, 28, 1146, 78195, 17675111, 9829599051, 14061129641181, 51771244646074395 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A300465.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A300465.

Sequence in context: A292806 A113633 A186491 * A009674 A143598 A324077

Adjacent sequences:  A300456 A300457 A300458 * A300460 A300461 A300462

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 06 2018

STATUS

approved

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Last modified May 29 20:42 EDT 2020. Contains 334710 sequences. (Running on oeis4.)