A257431 Number of (6+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal minimum nondecreasing horizontally, vertically and ne-to-sw antidiagonally

514920, 1293242, 3917190, 13233402, 36423140, 115919394, 356678661, 1013024839, 2950063325, 8706010338, 24924494772, 71250809523, 201815907569, 564593588950, 1576308803788, 4393237742809, 12206840093658, 33862403008984

Offset

1,1

Comments

Row 6 of A257426

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Cf. A257426

Sequence in context: A336060 A329461 A257424 * A254240 A087096 A072959

Adjacent sequences: A257428 A257429 A257430 * A257432 A257433 A257434

Keyword

nonn

Author

R. H. Hardin, Apr 22 2015

Status

approved