A207688 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 1 vertically.

2, 16, 60, 256, 1872, 15376, 145200, 1887876, 32939236, 653211364, 16761239040, 557862597604, 24505820603880, 1374667445474064, 89177394083197716, 7769360160391840000, 912190244879661701508, 129010731422391263108196

Offset: 1

Author

R. H. Hardin Feb 19 2012

Keywords

• nonn

Comments

Diagonal of A207693.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..19

Crossrefs

Cf. A207693.