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A302218 Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
0, 3, 43, 934, 40395, 3420704, 553097760, 177191137344, 102914156897887, 122108799039662692 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A302224.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302224.

Sequence in context: A350924 A141060 A277496 * A302664 A201784 A340822

Adjacent sequences: A302215 A302216 A302217 * A302219 A302220 A302221

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 03 2018

STATUS

approved

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Last modified December 9 09:46 EST 2022. Contains 358700 sequences. (Running on oeis4.)