A260833 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

48, 131, 700, 2235, 3828, 19718, 80516, 181176, 766388, 3885356, 12122540, 43330160, 229463444, 972300920, 3559612500, 17890822312, 91527500980

Offset: 1

Author

R. H. Hardin, Aug 01 2015

Keywords

• nonn

Comments

Diagonal of A260841

Examples

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

Crossrefs

Cf. A260841