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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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 19 2013
STATUS
approved

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Last modified March 4 22:06 EST 2024. Contains 370532 sequences. (Running on oeis4.)