A301778 Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

1, 8, 240, 25872, 10033408, 14004742144, 70356843337600, 1272146363687760896, 82788264567204704083456, 19391044190172624196057083904, 16346860632996556855602568035358720

Offset

1,2

Comments

Diagonal of A301784.

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

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

Crossrefs

Cf. A301784.

Sequence in context: A319851 A320605 A302005 * A158263 A367629 A221417

Adjacent sequences: A301775 A301776 A301777 * A301779 A301780 A301781

Keyword

nonn

Author

R. H. Hardin, Mar 26 2018

Status

approved