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 A180998 Number of (n+1)xn binary matrices with rows and columns each in strictly increasing order as binary numbers and no 1 neighboring another 1 2
 1, 1, 2, 5, 21, 124, 1145, 15521, 320688, 9876633, 459462273, 32032593512, 3362495995045, 529976350066025, 125628977242518536, 44744362871512206777, 23958150449772962130381, 19279048205688770346279728 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Subdiagonal 1 of A180997 LINKS R. H. Hardin, Table of n, a(n) for n=1..25 EXAMPLE All solutions for 5X4 ..0..0..0..0....0..0..0..0....0..0..0..0....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..1....0..1..0..1 ..1..0..0..0....1..0..1..0....1..0..0..1....1..0..0..0....1..0..1..0 CROSSREFS Sequence in context: A212922 A243272 A139153 * A144271 A193189 A176527 Adjacent sequences:  A180995 A180996 A180997 * A180999 A181000 A181001 KEYWORD nonn AUTHOR R. H. Hardin Sep 30 2010 STATUS approved

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Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)