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%I #8 Oct 01 2021 18:30:06
%S 7,43,409,6176,150132,5920734,384523522,42202897239,8122473947642,
%T 2916065637047374
%N Number of (n+1) X (n+1) 0..1 arrays with rows and columns of permanents of all 2 X 2 subblocks lexicographically nondecreasing, and all 2 X 2 permanents nonzero.
%C Diagonal of A204740.
%e Some solutions for n=4
%e ..1..1..1..0..1....0..1..1..0..1....0..1..0..1..1....1..1..0..1..1
%e ..1..0..1..1..0....1..0..1..1..1....1..0..1..1..1....1..0..1..1..1
%e ..1..1..0..1..1....0..1..1..1..1....1..1..0..1..1....1..1..0..1..1
%e ..1..0..1..0..1....1..0..1..1..1....0..1..1..1..1....0..1..1..1..1
%e ..1..1..1..1..1....1..1..1..1..1....1..0..1..1..1....1..1..0..1..1
%Y Cf. A204740.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 18 2012
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