A222772 Number of 4Xn 0..1 arrays with exactly floor(4Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

0, 20, 96, 465, 2608, 15077, 89811, 544302, 3349328, 20823047, 130535918, 823585242, 5221057054, 33231082276, 212180118775, 1358528423728, 8718262087314, 56062919553225, 361148981248207, 2330144611056838

Offset: 1

Author

R. H. Hardin Mar 05 2013

Keywords

• nonn

Comments

Row 4 of A222769

Examples

			Some solutions for n=3
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..1....0..0..0
..0..1..0....1..1..1....0..0..1....0..0..0....0..1..0....0..0..0....0..0..1
..1..0..0....0..1..1....0..0..0....0..1..0....0..0..0....0..1..1....0..0..1
..0..0..0....1..1..1....0..1..1....0..1..1....0..0..0....1..1..1....0..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..45