A180992 Number of (n+3)xn binary matrices with rows and then columns in strictly increasing order as binary numbers

0, 0, 6, 873, 194176, 91610331, 106664349231, 337206602197275, 3097011674559184126, 86891156143807447975507, 7735857823114195427126194239, 2249860503567334385742963521466736

Offset

1,3

Comments

Subdiagonal 3 of A180989

Links

Table of n, a(n) for n=1..12.

Example

All solutions for 6X3
..0..0..0....0..0..0....0..0..0....0..0..1....0..0..1....0..0..1
..0..0..1....0..0..1....0..1..1....0..1..0....0..1..0....0..1..1
..0..1..0....0..1..1....1..0..0....0..1..1....1..0..0....1..0..0
..1..0..0....1..0..0....1..0..1....1..0..0....1..0..1....1..0..1
..1..0..1....1..0..1....1..1..0....1..0..1....1..1..0....1..1..0
..1..1..0....1..1..0....1..1..1....1..1..0....1..1..1....1..1..1

Crossrefs

Sequence in context: A064430 A332186 A279304 * A229629 A137801 A076667

Adjacent sequences: A180989 A180990 A180991 * A180993 A180994 A180995

Keyword

nonn

Author

R. H. Hardin Sep 30 2010

Status

approved