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A227674 Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having an odd sum, with rows and columns of the latter in lexicographically nondecreasing order 0

%I

%S 2,16,283,11971,1330361,418147052,392636087774,1142471406383630

%N Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having an odd sum, with rows and columns of the latter in lexicographically nondecreasing order

%C Diagonal of A227679

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 19 2013

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Last modified October 19 22:28 EDT 2018. Contains 316378 sequences. (Running on oeis4.)