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A227381 Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having a sum of one, with rows and columns of the latter in lexicographically nondecreasing order 1
2, 7, 54, 1104, 61127, 8988949, 3657501287 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A227385
LINKS
EXAMPLE
Some solutions for n=4
..0..0..1..0....0..0..0..0....0..1..0..0....0..0..1..0....0..0..1..0
..1..0..0..1....0..1..0..0....1..0..0..1....0..1..0..1....1..0..0..0
..0..0..1..0....1..0..0..0....0..1..1..0....0..0..1..1....0..0..0..1
..0..0..0..1....0..0..0..0....0..0..0..0....0..0..1..1....0..1..1..0
CROSSREFS
Sequence in context: A283335 A326207 A280221 * A182055 A358944 A366456
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 09 2013
STATUS
approved

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Last modified March 28 08:22 EDT 2024. Contains 371236 sequences. (Running on oeis4.)