A204733 Number of (n+1) X (n+1) 0..1 arrays with rows and columns of permanents of all 2 X 2 subblocks lexicographically nondecreasing, and all 2 X 2 permanents nonzero.

7, 43, 409, 6176, 150132, 5920734, 384523522, 42202897239, 8122473947642, 2916065637047374

Offset

1,1

Comments

Diagonal of A204740.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A204740.

Sequence in context: A292502 A294361 A345075 * A195230 A316635 A222981

Adjacent sequences: A204730 A204731 A204732 * A204734 A204735 A204736

Keyword

nonn

Author

R. H. Hardin, Jan 18 2012

Status

approved