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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
0
3, 26, 335, 10050, 786154, 168973605, 104606988712
OFFSET
1,1
COMMENTS
Diagonal of A227025
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 27 2013
STATUS
approved