A302005 Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 240, 25808, 9989376, 13918667808, 69786476414080, 1259406594247832896, 81801738558534434812512, 19123141293346274424868082896, 16090014430301966976090685132636800

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 A367629

Adjacent sequences: A302002 A302003 A302004 * A302006 A302007 A302008

Keyword

nonn

Author

R. H. Hardin, Mar 30 2018

Status

approved