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A180993 Number of (n+4)xn binary matrices with rows and then columns in strictly increasing order as binary numbers 0
0, 0, 4, 2200, 1283875, 1408620622, 3595756291357, 24101118080151321, 459717083252930306823, 26428405768066461371584216, 4776623401553625413419662091924 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 3 16:55 EST 2022. Contains 358534 sequences. (Running on oeis4.)