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 A180996 Number of n X n binary matrices with rows and columns each in strictly increasing order as binary numbers and no 1 neighboring another 1 1
 2, 2, 3, 7, 26, 145, 1269, 16666, 336209, 10197321, 469338906, 32492055785, 3394528588557, 533338846061070, 126158953592584561, 44869991848754725313, 24002894812644474337158, 19303006356138543308410109 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A180997 LINKS R. H. Hardin, Table of n, a(n) for n=1..24 EXAMPLE All solutions for 4X4 ..0..0..0..0....0..0..0..0....0..0..0..1....0..0..0..1....0..0..0..1 ..0..0..0..1....0..0..0..1....0..0..1..0....0..0..1..0....0..0..1..0 ..0..0..1..0....0..0..1..0....0..1..0..0....0..1..0..0....0..1..0..0 ..0..1..0..0....0..1..0..1....1..0..0..0....1..0..1..0....1..0..0..1 ... ..0..0..0..1....0..0..0..1 ..0..0..1..0....0..0..1..0 ..0..1..0..1....0..1..0..1 ..1..0..0..0....1..0..1..0 CROSSREFS Sequence in context: A185387 A038507 A077001 * A307503 A087522 A092970 Adjacent sequences:  A180993 A180994 A180995 * A180997 A180998 A180999 KEYWORD nonn AUTHOR R. H. Hardin Sep 30 2010 STATUS approved

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Last modified August 20 03:33 EDT 2019. Contains 326139 sequences. (Running on oeis4.)