A257419 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal minimum nondecreasing horizontally, vertically and ne-to-sw antidiagonally

512, 7652, 117324, 1770206, 12316842, 115919394, 1037269100, 6191314193, 57799643410, 478127487069, 2903676329504, 27615631745955, 219195987569254, 1325497215293808

Offset

1,1

Comments

Diagonal of A257426

Links

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

Example

Some solutions for n=3
..0..0..0..1..0....0..0..1..1..1....0..0..0..0..0....1..0..0..1..1
..0..0..0..1..1....0..0..0..0..0....1..0..0..0..1....0..0..1..0..1
..0..1..1..1..0....1..1..0..1..0....0..0..1..1..1....0..0..0..0..1
..0..0..0..0..0....0..1..0..1..1....1..1..1..1..0....0..1..1..1..1
..0..1..1..0..1....0..0..0..1..1....0..1..1..1..0....0..1..1..1..0

Crossrefs

Cf. A257426

Sequence in context: A254012 A258518 A222775 * A255749 A251186 A257202

Adjacent sequences: A257416 A257417 A257418 * A257420 A257421 A257422

Keyword

nonn

Author

R. H. Hardin, Apr 22 2015

Status

approved