A257202 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally and vertically

512, 7800, 49932, 387056, 654637, 516615, 848628, 1271947, 1749293, 2675122, 3991360, 5698952, 8019568, 11234476, 15595519, 21319231, 28669112, 38015446, 50100115, 65102076, 83309215, 106038988, 134027052, 167393397, 207962738

Offset

1,1

Comments

Diagonal of A257209

Links

R. H. Hardin, Table of n, a(n) for n = 1..31

Example

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

Crossrefs

Cf. A257209

Sequence in context: A257419 A255749 A251186 * A070057 A017619 A253928

Adjacent sequences: A257199 A257200 A257201 * A257203 A257204 A257205

Keyword

nonn

Author

R. H. Hardin, Apr 18 2015

Status

approved