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Number of (n+1) X 7 0..2 arrays with rows and columns of permanents of all 2 X 2 subblocks lexicographically nondecreasing, and all 2 X 2 permanents nonzero.
0

%I #6 Mar 25 2022 18:34:08

%S 58892,11675764,3408343704,1029060698687,315651250338121

%N Number of (n+1) X 7 0..2 arrays with rows and columns of permanents of all 2 X 2 subblocks lexicographically nondecreasing, and all 2 X 2 permanents nonzero.

%C Column 6 of A205235.

%e Some solutions for n=4

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

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

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

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

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

%Y Cf. A205235.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 24 2012