A257353 Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum or central row sum less than the central column sum

220, 2116, 17056, 101124, 482560, 2433600, 12278736, 62948356, 314007680, 1594085476, 8000673008, 40717589796, 204018474192, 1037122265664, 5200337912080, 26444894851600, 132569860224000, 674054417903364

Offset

1,1

Comments

Diagonal of A257361

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

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

Crossrefs

Cf. A257361

Sequence in context: A180219 A233626 A251322 * A211820 A215491 A258537

Adjacent sequences: A257350 A257351 A257352 * A257354 A257355 A257356

Keyword

nonn

Author

R. H. Hardin, Apr 20 2015

Status

approved