A301835 Number of n X n 0..1 arrays with every element equal to 0, 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 139, 5748, 496085, 97439921, 41966406867, 39919204098331, 84196647385137200, 391960289300558475785, 4034683591387591205214712, 91832712356420807374009031299, 4618825005074327343319160956639454

Offset

1,2

Comments

Diagonal of A301841.

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

Some solutions for n=5
..0..0..0..1..0. .0..0..1..0..0. .0..0..1..0..0. .0..0..1..0..0
..1..0..1..0..1. .0..1..0..1..0. .0..1..0..1..0. .0..0..0..1..0
..1..0..1..0..0. .1..0..1..1..0. .1..0..0..1..0. .1..1..0..1..1
..0..0..1..0..1. .1..0..0..1..1. .1..0..1..0..0. .1..1..0..1..0
..0..0..1..0..0. .0..1..0..1..1. .0..0..1..0..1. .1..1..1..0..0

Crossrefs

Cf. A301841.

Sequence in context: A050789 A274669 A187236 * A091060 A201094 A061996

Adjacent sequences: A301832 A301833 A301834 * A301836 A301837 A301838

Keyword

nonn

Author

R. H. Hardin, Mar 27 2018

Status

approved