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 A267239 Number of n X n binary arrays with row sums nondecreasing and columns lexicographically nondecreasing. 0
 2, 7, 42, 567, 20040, 2093467, 683027146, 723576702570, 2549735632656528, 30465608408449993885, 1250919952257037350168062, 178764247753852768666003981113, 89752660973687899647122735126286078 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A267245. LINKS Table of n, a(n) for n=1..13. EXAMPLE Some solutions for n=4 ..0..0..0..1....0..0..0..1....0..0..1..1....0..0..0..1....0..0..0..1 ..0..1..1..0....0..0..0..1....0..1..0..1....0..0..1..1....0..0..1..1 ..1..0..1..0....0..0..1..1....1..1..0..0....0..1..0..1....1..1..1..0 ..1..1..1..1....1..1..1..0....1..1..0..0....1..1..1..0....1..1..0..1 CROSSREFS Cf. A267245. Sequence in context: A091669 A108042 A152559 * A001174 A067975 A065298 Adjacent sequences: A267236 A267237 A267238 * A267240 A267241 A267242 KEYWORD nonn AUTHOR R. H. Hardin, Jan 12 2016 STATUS approved

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Last modified April 20 09:30 EDT 2024. Contains 371799 sequences. (Running on oeis4.)