A304264 Number of n X n 0..1 arrays with every element unequal to 0, 1, 5 or 8 king-move adjacent elements, with upper left element zero.

1, 1, 6, 21, 146, 1246, 13767, 252509, 5755625, 177353720, 8354131403, 523250794396, 44173651472383, 5428616779817049, 920678621074132173, 212277158481925445968, 69198443091508695982216

Offset

1,3

Comments

Diagonal of A304270.

Links

R. H. Hardin, Table of n, a(n) for n = 1..22

Example

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

Crossrefs

Cf. A304270.

Sequence in context: A318103 A058821 A054366 * A210443 A179768 A131960

Adjacent sequences: A304261 A304262 A304263 * A304265 A304266 A304267

Keyword

nonn

Author

R. H. Hardin, May 09 2018

Status

approved