A204706 Number of (n+1)X(n+1) 0..1 arrays with the permanents of all 2X2 subblocks equal and nonzero

7, 33, 257, 3473, 73345, 2542369, 140090241, 12503757969, 1787244586881, 411927241028353, 152442345546739969, 90819596095626887105, 86960426240537811217921, 133963874202574308172821153

Offset

1,1

Comments

Diagonal of A204713

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

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

Crossrefs

Sequence in context: A292427 A333565 A215125 * A197995 A207150 A197565

Adjacent sequences: A204703 A204704 A204705 * A204707 A204708 A204709

Keyword

nonn

Author

R. H. Hardin Jan 18 2012

Status

approved