A254560 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the four sums of the central row, central column, diagonal and antidiagonal nondecreasing horizontally and vertically

512, 10870, 312322, 2148260, 10679860, 67038844, 206491388, 1250249820, 5063238114, 28541610636, 134752005110, 745481127674, 3775535862318, 20661615040104, 108055326376786, 586769234129672, 3112281471218398

Offset

1,1

Comments

Diagonal of A254568

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Example

Some solutions for n=2
..1..1..0..1....0..0..1..0....1..1..0..1....0..0..0..1....1..0..0..0
..0..0..1..0....1..0..0..0....1..0..1..0....0..0..1..0....1..0..1..0
..1..0..1..1....0..0..0..1....0..0..1..0....1..0..1..0....1..0..1..1
..0..1..1..0....0..1..1..1....1..1..0..1....1..0..0..1....0..1..1..1

Crossrefs

Sequence in context: A344305 A254797 A254837 * A257182 A288776 A200844

Adjacent sequences: A254557 A254558 A254559 * A254561 A254562 A254563

Keyword

nonn

Author

R. H. Hardin, Feb 01 2015

Status

approved