A227020 - OEIS

%I #5 Dec 18 2015 18:18:36

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

%N 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

%C Diagonal of A227025

%e Some solutions for n=4

%e ..0..0..1..1....0..1..0..1....0..0..1..1....0..0..0..1....0..1..0..1

%e ..0..1..0..0....0..0..0..1....0..1..0..0....0..0..2..0....0..0..0..0

%e ..1..0..0..1....0..1..1..1....1..0..1..1....0..1..0..1....1..1..0..1

%e ..0..0..1..2....1..1..0..1....0..0..1..1....0..0..0..0....1..1..1..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 27 2013