A206995 Number of n X n 0..1 arrays avoiding 0 1 0 horizontally and 0 1 1 vertically

2, 16, 230, 6612, 382349, 45723467, 10432265840, 4567604720632, 3835202074248503, 6261201402096526687, 19792947737197868206612, 121328664454799987875557245, 1441630925698363945645049021360

Offset

1,1

Comments

Diagonal of A207000

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Sequence in context: A188515 A152542 A206877 * A206779 A233288 A181218

Adjacent sequences: A206992 A206993 A206994 * A206996 A206997 A206998

Keyword

nonn

Author

R. H. Hardin Feb 14 2012

Status

approved