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A302005 Number of nXn 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
1, 8, 240, 25808, 9989376, 13918667808, 69786476414080, 1259406594247832896, 81801738558534434812512, 19123141293346274424868082896, 16090014430301966976090685132636800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A302010.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..17

EXAMPLE

Some solutions for n=5

..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0

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

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

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

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

CROSSREFS

Cf. A302010.

Sequence in context: A007060 A319851 A320605 * A301778 A158263 A221417

Adjacent sequences:  A302002 A302003 A302004 * A302006 A302007 A302008

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 30 2018

STATUS

approved

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Last modified May 19 21:23 EDT 2019. Contains 323410 sequences. (Running on oeis4.)