A184539 Number of (n+2)X(n+2) binary arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

45, 193, 631, 1837, 5313, 16345, 54543, 194245, 719905, 2725367, 10430675, 40158073, 155173369, 601154073, 2333701711, 9075257125, 35345417073, 137846719279, 538258108483, 2104099248441, 8233431070825, 32247604093423

Offset: 1

Author

R. H. Hardin Jan 16 2011

Keywords

• nonn

Comments

Diagonal of A184548

Examples

			Some solutions for 4X4
..0..0..1..1....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..1
..0..0..1..1....0..0..0..1....0..0..0..0....0..0..0..1....0..1..1..1
..1..1..0..1....0..0..1..1....0..0..1..1....0..0..0..1....0..1..1..1
..1..1..0..1....0..0..1..1....1..1..0..0....0..0..0..1....0..1..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..68