A253928 Number of (n+2) X (n+2) 0..1 arrays with every 3 X 3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally and vertically.

512, 8384, 124496, 1664470, 3515548, 11962178, 31663440, 59454484, 186710316, 670206564, 2390903880, 9098362320, 35531364902, 139249093536, 552399655264, 2200430718254, 8770350224230, 35026923585084, 140023496693106

Offset

1,1

Comments

Diagonal of A253935.

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

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

Crossrefs

Cf. A253935.

Sequence in context: A257202 A070057 A017619 * A254887 A256896 A254234

Adjacent sequences: A253925 A253926 A253927 * A253929 A253930 A253931

Keyword

nonn

Author

R. H. Hardin, Jan 19 2015

Status

approved