A257203 Number of (n+2)X(2+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

2423, 7800, 20815, 67606, 191070, 443711, 992467, 2153497, 4441745, 8865989, 17513940, 33716004, 63122416, 116916487, 215061906, 390592396, 702133715, 1252287829, 2218180477, 3907760319, 6851939815, 11959426756, 20788960871

Offset

1,1

Comments

Column 2 of A257209

Links

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

Example

Some solutions for n=4
..1..0..0..1....0..1..0..0....0..1..0..0....1..1..0..1....0..0..0..0
..0..0..0..0....0..1..0..0....0..0..0..1....0..1..0..0....0..1..0..0
..1..0..0..1....0..1..0..0....0..0..0..1....0..1..0..0....0..1..0..1
..1..1..1..1....1..1..0..0....1..1..0..0....1..1..1..1....1..1..0..1
..0..0..0..0....0..0..0..1....0..0..0..1....1..0..1..1....0..0..0..1
..0..1..1..0....0..1..1..1....1..0..0..1....1..1..1..1....1..0..1..1

Crossrefs

Cf. A257209

Sequence in context: A131759 A254901 A254908 * A156120 A078868 A340433

Adjacent sequences: A257200 A257201 A257202 * A257204 A257205 A257206

Keyword

nonn

Author

R. H. Hardin, Apr 18 2015

Status

approved