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

1,1

Comments

Diagonal of A227025

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A326396 A109074 A357337 * A119293 A339298 A366315

Adjacent sequences: A227017 A227018 A227019 * A227021 A227022 A227023

Keyword

nonn

Author

R. H. Hardin Jun 27 2013

Status

approved