A254992 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the diagonal and antidiagonal minus the sum of the medians of the central row and column nondecreasing horizontally and vertically

2679, 14320, 70331, 369357, 1939341, 10216539, 54357112, 289904665, 1544994778, 8237573436, 43939277433, 234399968825, 1250409023076, 6670253180113, 35582350188965, 189813584961248, 1012551819177382, 5401379190197737

Offset

1,1

Comments

Column 2 of A254998

Links

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

Example

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

Crossrefs

Cf. A254998

Sequence in context: A345825 A258505 A258512 * A252210 A252203 A252202

Adjacent sequences: A254989 A254990 A254991 * A254993 A254994 A254995

Keyword

nonn

Author

R. H. Hardin, Feb 11 2015

Status

approved