A227020 Number of n X n (0,1,2) arrays of permanents of 2X2 subblocks of some (n+1)X(n+1) binary array with rows and columns of the latter in lexicographically nondecreasing order.

3, 26, 335, 10050, 786154, 168973605, 104606988712

Offset: 1

Author

R. H. Hardin Jun 27 2013

Keywords

• nonn

Comments

Diagonal of A227025

Examples

			Some solutions for n=4
..0..0..1..1....0..1..0..1....0..0..1..1....0..0..0..1....0..1..0..1
..0..1..0..0....0..0..0..1....0..1..0..0....0..0..2..0....0..0..0..0
..1..0..0..1....0..1..1..1....1..0..1..1....0..1..0..1....1..1..0..1
..0..0..1..2....1..1..0..1....0..0..1..1....0..0..0..0....1..1..1..2