A219304 Unchanging value maps: number of n X n binary arrays indicating the locations of corresponding elements unequal to no horizontal or vertical neighbor in a random 0..2 n X n array

1, 6, 90, 3334, 326444, 89981627, 68906619754, 144049729095880

Offset

1,2

Comments

Diagonal of A219310

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3
..0..0..0....1..0..0....1..1..1....1..0..0....0..0..0....0..1..1....1..1..1
..0..0..0....0..0..1....1..1..0....1..0..0....0..0..1....0..0..1....0..0..0
..0..0..0....1..0..0....1..0..0....1..1..0....0..0..1....0..1..1....0..0..0

Crossrefs

Sequence in context: A013297 A232979 A218758 * A305324 A265088 A077370

Adjacent sequences: A219301 A219302 A219303 * A219305 A219306 A219307

Keyword

nonn

Author

R. H. Hardin Nov 17 2012

Status

approved