A207677 Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 1 1 vertically

2, 16, 72, 436, 2310, 11994, 65564, 379618, 2306234, 15546084, 105736196, 882008157, 7460256028, 79554888778, 842718226878, 10871887456045, 151150820925264, 2491064356652975, 43353562677488606, 900988265135221518

Offset

1,1

Comments

Diagonal of A207682

Links

Table of n, a(n) for n=1..20.

Example

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

Crossrefs

Sequence in context: A007758 A207874 A208374 * A207508 A208063 A207923

Adjacent sequences: A207674 A207675 A207676 * A207678 A207679 A207680

Keyword

nonn

Author

R. H. Hardin Feb 19 2012

Status

approved