A222628 Number of n X n 0..1 arrays with no more than floor(n X n/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order

1, 1, 5, 161, 3200, 314146, 34323408, 16813884210, 8503001699073, 19277280866911336

Offset

1,3

Comments

Diagonal of A222635

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A197310 A266525 A085330 * A287032 A136368 A229163

Adjacent sequences: A222625 A222626 A222627 * A222629 A222630 A222631

Keyword

nonn

Author

R. H. Hardin Feb 26 2013

Status

approved