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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
 2, 16, 283, 11971, 1330361, 418147052, 392636087774, 1142471406383630 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A227679 LINKS EXAMPLE Some solutions for n=4 ..0..0..1..0....0..1..0..0....0..1..0..0....1..0..0..0....0..0..0..1 ..1..0..1..1....1..0..0..0....0..0..0..1....0..0..1..1....0..0..1..0 ..0..0..1..0....0..1..1..1....1..0..0..0....0..1..0..1....0..1..1..0 ..1..0..0..1....0..1..1..1....0..1..0..0....1..1..1..1....1..0..0..1 CROSSREFS Sequence in context: A000182 A009764 A189257 * A102599 A123744 A136796 Adjacent sequences:  A227671 A227672 A227673 * A227675 A227676 A227677 KEYWORD nonn AUTHOR R. H. Hardin Jul 19 2013 STATUS approved

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Last modified October 20 15:29 EDT 2019. Contains 328267 sequences. (Running on oeis4.)