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 A227264 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 three or less, with rows and columns of the latter in lexicographically nondecreasing order 0
 2, 8, 49, 513, 10906, 498772, 48265519, 9879827545, 4332146485870 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A227269 LINKS EXAMPLE Some solutions for n=4 ..1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1 ..1..0..0..1....1..1..1..1....0..1..1..1....1..1..1..1....1..0..1..1 ..1..1..0..1....1..1..1..0....0..1..1..1....0..1..1..1....1..0..1..1 ..1..1..1..1....1..0..0..1....0..0..0..0....0..0..0..1....1..0..0..1 CROSSREFS Sequence in context: A332237 A136226 A046165 * A114619 A027047 A034491 Adjacent sequences:  A227261 A227262 A227263 * A227265 A227266 A227267 KEYWORD nonn AUTHOR R. H. Hardin Jul 04 2013 STATUS approved

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Last modified August 10 20:21 EDT 2022. Contains 356039 sequences. (Running on oeis4.)