A181218 Number of n X n binary matrices with no three 1's adjacent in a line horizontally, vertically, diagonally or antidiagonally

2, 16, 230, 10732, 1495392, 507962194, 493466099722, 1328921689649459, 9633695407844528952, 192630734231370260714836, 10572973250296811381776668634

Offset

1,1

Comments

Diagonal of A181224

Links

Table of n, a(n) for n=1..11.

Example

Some avoided solutions for 3X3
..1..1..1....1..0..0....0..0..1....1..1..1....1..0..0....1..1..0....1..0..0
..0..0..0....0..1..1....0..1..0....0..0..1....0..0..0....0..1..0....1..0..0
..0..0..1....0..0..1....1..0..1....0..0..0....1..1..1....0..0..1....1..1..0

Crossrefs

Sequence in context: A206995 A206779 A233288 * A301581 A280394 A223614

Adjacent sequences: A181215 A181216 A181217 * A181219 A181220 A181221

Keyword

nonn

Author

R. H. Hardin Oct 10 2010

Status

approved