A190631 Half the number of n X n symmetric binary matrices with no element equal to a strict majority of its king- and knight-move neighbors

1, 1, 2, 7, 34, 193, 1540, 18231, 316852, 8478040, 322171328

Offset

1,3

Links

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

Example

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

Crossrefs

Sequence in context: A020054 A206240 A289720 * A326560 A199475 A241599

Adjacent sequences: A190628 A190629 A190630 * A190632 A190633 A190634

Keyword

nonn

Author

R. H. Hardin May 14 2011

Status

approved