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

1,1

Comments

Diagonal of A208085.

Links

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

Example

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

Crossrefs

Cf. A208085.

Sequence in context: A175429 A297639 A094253 * A214905 A230987 A060668

Adjacent sequences: A208081 A208082 A208083 * A208085 A208086 A208087

Keyword

nonn

Author

R. H. Hardin, Feb 23 2012

Status

approved