A190627 Half the number of n X n symmetric binary matrices with no element equal to a strict majority of its king-move neighbors

1, 1, 3, 9, 46, 462, 6253, 132061, 4611023, 250827373, 21305367718, 2862744251998, 605949209796465, 201612254630124309

Offset

1,3

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for n=4 with a(1,1)=0
..0..1..1..0....0..1..0..1....0..1..0..1....0..1..0..0....0..1..0..1
..1..0..0..1....1..1..0..1....1..1..0..0....1..0..1..1....1..1..0..1
..1..0..0..1....0..0..0..1....0..0..1..1....0..1..0..0....0..0..1..0
..0..1..1..0....1..1..1..0....1..0..1..0....0..1..0..1....1..1..0..1

Crossrefs

Sequence in context: A107090 A190625 A317079 * A221986 A018445 A129432

Adjacent sequences: A190624 A190625 A190626 * A190628 A190629 A190630

Keyword

nonn

Author

R. H. Hardin May 14 2011

Status

approved