A255141 Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 and no antidiagonal sum 0 and no row sum 1 and no column sum 1

47, 371, 6271, 190731, 10864279, 1141237349, 215697143322, 73492753345771, 45252431432900378, 50274563122404978583, 100732007486237755775772, 364115407117554783582241759

Offset

1,1

Comments

Diagonal of A255149

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=4
..1..1..1..0..1..1....1..0..1..1..1..0....1..0..1..1..0..1....1..1..1..0..1..1
..1..1..0..1..1..1....1..1..1..1..1..1....1..1..1..0..1..1....0..1..1..1..0..1
..1..1..1..1..0..1....1..1..1..0..1..1....1..1..1..1..1..1....1..1..0..1..1..1
..1..1..1..1..1..1....1..1..1..1..1..1....1..0..1..1..0..1....1..1..1..1..1..1
..1..1..1..1..1..0....1..0..1..1..1..0....0..1..1..1..1..0....1..1..1..0..1..1
..1..1..1..1..0..1....1..1..1..1..0..1....1..1..1..0..1..1....1..0..1..1..0..1

Crossrefs

Cf. A255149

Sequence in context: A219442 A055828 A244770 * A142694 A213216 A324625

Adjacent sequences: A255138 A255139 A255140 * A255142 A255143 A255144

Keyword

nonn

Author

R. H. Hardin, Feb 15 2015

Status

approved