A302421 Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 3, 11, 42, 372, 4231, 48037, 1171867, 30957683, 1262711362, 67345167687, 6258369400424

Offset

1,2

Comments

Diagonal of A302427.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A302427.

Sequence in context: A149070 A066655 A352684 * A118166 A277888 A249568

Adjacent sequences: A302418 A302419 A302420 * A302422 A302423 A302424

Keyword

nonn

Author

R. H. Hardin, Apr 07 2018

Status

approved