A180993 Number of (n+4)xn binary matrices with rows and then columns in strictly increasing order as binary numbers

0, 0, 4, 2200, 1283875, 1408620622, 3595756291357, 24101118080151321, 459717083252930306823, 26428405768066461371584216, 4776623401553625413419662091924

Offset

1,3

Comments

Subdiagonal 4 of A180989

Links

Table of n, a(n) for n=1..11.

Example

All solutions for 7X3
..0..0..0....0..0..0....0..0..0....0..0..1
..0..0..1....0..0..1....0..0..1....0..1..0
..0..1..0....0..1..0....0..1..1....0..1..1
..0..1..1....1..0..0....1..0..0....1..0..0
..1..0..0....1..0..1....1..0..1....1..0..1
..1..0..1....1..1..0....1..1..0....1..1..0
..1..1..0....1..1..1....1..1..1....1..1..1

Crossrefs

Sequence in context: A220941 A012869 A172941 * A192889 A062407 A212799

Adjacent sequences: A180990 A180991 A180992 * A180994 A180995 A180996

Keyword

nonn

Author

R. H. Hardin Sep 30 2010

Status

approved