A263793 Number of (n+1) X (n+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits, and rows and columns lexicographically nonincreasing.

2, 2, 7, 7, 61, 616, 62904, 20141827

Offset: 1

Author

R. H. Hardin, Oct 26 2015

Keywords

• nonn
• more

Comments

Diagonal of A263799.

Examples

			Some solutions for n=5:
..1..1..1..1..0..0....1..1..1..1..0..0....1..1..1..1..0..0....1..1..1..1..0..0
..1..1..1..1..0..0....1..1..0..0..1..1....1..1..1..1..0..0....1..1..1..1..0..0
..1..1..0..0..1..1....1..0..1..0..1..0....0..0..0..0..1..1....1..1..0..0..0..0
..1..1..0..0..1..1....1..0..0..1..0..0....0..0..0..0..1..1....1..1..0..0..0..0
..0..0..0..0..1..1....0..0..1..0..0..1....0..0..0..0..1..1....1..0..1..0..1..0
..0..0..0..0..1..1....0..0..0..0..0..0....0..0..0..0..1..1....1..0..1..0..1..0
		

Crossrefs

Cf. A263799.