A302629 Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 3, 8, 33, 257, 2262, 30216, 652931, 18446157, 797627174, 48788464441, 4420985966927, 579498900792438, 110425750437014304, 30435339544089493297

Offset

1,2

Comments

Diagonal of A302635.

Links

Table of n, a(n) for n=1..15.

Example

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

Crossrefs

Cf. A302635.

Sequence in context: A109655 A184255 A001120 * A339315 A322303 A117722

Adjacent sequences: A302626 A302627 A302628 * A302630 A302631 A302632

Keyword

nonn

Author

R. H. Hardin, Apr 10 2018

Status

approved