A207019 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.

2, 16, 90, 558, 3315, 16038, 95900, 492932, 2542374, 14009768, 70576726, 371721351, 1947251540, 9924535935, 51877222492, 266862076008, 1370454630930, 7087023247175, 36312119188998, 186625648529320, 958786992765737

Offset: 1

Author

R. H. Hardin Feb 14 2012

Keywords

• nonn

Comments

Diagonal of A207024

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..31