A190659 Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its king- and knight-move neighbors.

1, 1, 1, 3, 3, 8, 20, 53, 141, 552, 2419, 12788, 78700, 561036, 4750312

Offset

1,4

Links

Table of n, a(n) for n=1..15.

Example

All solutions for n=5 with a(1,1)=0
..0..0..0..0..0....0..0..0..1..1....0..0..1..1..1
..0..0..0..0..0....0..0..0..1..1....0..0..1..1..1
..0..0..0..0..0....0..0..0..1..1....1..1..0..0..0
..0..0..0..0..0....1..1..1..0..0....1..1..0..0..0
..0..0..0..0..0....1..1..1..0..0....1..1..0..0..0

Crossrefs

Sequence in context: A049974 A049972 A027376 * A202536 A038068 A267952

Adjacent sequences: A190656 A190657 A190658 * A190660 A190661 A190662

Keyword

nonn

Author

R. H. Hardin, May 16 2011

Status

approved