A298281 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.

1, 8, 70, 649, 8264, 121368, 2195114, 55665676, 2065512284, 105764508137, 7817598459732, 873942008386780, 140850901178992246

Offset

1,2

Comments

Diagonal of A298287.

Links

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

Example

Some solutions for n=6
..0..1..0..1..0..0. .0..1..0..0..1..1. .0..1..0..1..1..0. .0..1..1..0..0..1
..0..1..0..1..0..1. .0..1..0..1..0..0. .0..1..0..0..0..0. .1..0..1..1..1..0
..0..0..0..1..1..1. .0..1..0..1..1..1. .1..0..1..1..1..1. .1..0..0..0..0..0
..0..1..0..1..0..1. .0..1..0..0..0..0. .1..0..1..0..0..1. .0..1..1..1..1..1
..1..1..0..1..0..1. .1..0..1..1..1..1. .1..0..1..0..1..0. .0..0..1..0..0..0
..0..1..0..0..1..1. .1..1..0..0..0..0. .0..1..1..0..1..0. .0..1..1..1..0..1

Crossrefs

Cf. A298287.

Sequence in context: A056631 A190560 A266361 * A299355 A299175 A299938

Adjacent sequences: A298278 A298279 A298280 * A298282 A298283 A298284

Keyword

nonn

Author

R. H. Hardin, Jan 16 2018

Status

approved