A208084 Number of (n+1) X (n+1) 0..1 arrays with every 2 X 2 subblock having the same number of equal edges as its horizontal neighbors and a different number from its vertical neighbors, and new values 0..1 introduced in row major order.

8, 20, 134, 156, 2664, 1224, 54504, 9612, 1119906, 75492, 23025384, 592920, 473447592, 4656852, 9735152022, 36575388, 200177107272, 287266824, 4116102713928, 2256222924, 84636562515282, 17720604900, 1740322886860296

Offset: 1

Author

R. H. Hardin, Feb 23 2012

Keywords

• nonn

Comments

Diagonal of A208085.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..69

Crossrefs

Cf. A208085.