A206930 Number of n X n 0..1 arrays avoiding 0 0 0 horizontally and 0 1 1 vertically.

2, 16, 211, 6837, 418876, 40316253, 8138711727, 2968348851593, 1635655868695143, 1996781212118762256, 4440970754945359464401, 13563038968625915203795793

Offset: 1

Author

R. H. Hardin, Feb 13 2012

Keywords

• nonn

Comments

Diagonal of A206936.

Examples

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

Crossrefs

Cf. A206936.