login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A181008 Number of (n+4)xn binary matrices with rows and columns each in strictly increasing order as binary numbers and each row and column having an even number of 1s 0
0, 0, 0, 1, 214, 175257, 262890863, 971594134303, 10088497788330117 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Subdiagonal 4 of A181004

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

All solutions for 8X4

..0..0..0..0

..0..0..1..1

..0..1..0..1

..0..1..1..0

..1..0..0..1

..1..0..1..0

..1..1..0..0

..1..1..1..1

CROSSREFS

Sequence in context: A200901 A268547 A202319 * A191943 A046011 A038853

Adjacent sequences:  A181005 A181006 A181007 * A181009 A181010 A181011

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 30 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 26 02:56 EDT 2020. Contains 334613 sequences. (Running on oeis4.)