login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A181236 T(n,k)=Number of (k*n)Xn binary matrices with all row sums equal and all column sums equal 5
2, 2, 4, 2, 8, 14, 2, 22, 182, 140, 2, 72, 3362, 49772, 4322, 2, 254, 69302, 33235358, 113400002, 434542, 2, 926, 1513514, 27896484332, 5210265060002, 4027811102702, 144109562, 2, 3434, 34306274, 26012734507190, 298289608088472002 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Table starts
............2...................2....................2..................2
............4...................8...................22.................72
...........14.................182.................3362..............69302
..........140...............49772.............33235358........27896484332
.........4322...........113400002........5210265060002.298289608088472002
.......434542.......4027811102702.90698868503010138802...................
....144109562.1237505791330809002........................................
.165431317452............................................................
LINKS
EXAMPLE
All solutions for 6X2
..0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..0..0....0..1....0..1....0..1....0..1....1..0....1..0....1..0....1..0....1..0
..0..0....0..1....1..0....1..0....1..0....0..1....0..1....0..1....1..0....1..0
..0..0....1..0....0..1....1..0....1..0....0..1....1..0....1..0....0..1....0..1
..0..0....1..0....1..0....1..0....0..1....1..0....1..0....0..1....1..0....0..1
..0..0....1..0....1..0....0..1....1..0....1..0....0..1....1..0....0..1....1..0
...
..0..1....1..0....1..0....1..0....1..0....1..0....1..0....1..0....1..0....1..0
..1..0....0..1....0..1....0..1....0..1....0..1....0..1....1..0....1..0....1..0
..1..0....0..1....0..1....0..1....1..0....1..0....1..0....0..1....0..1....0..1
..1..0....0..1....1..0....1..0....0..1....0..1....1..0....0..1....0..1....1..0
..0..1....1..0....1..0....0..1....1..0....0..1....0..1....1..0....0..1....0..1
..0..1....1..0....0..1....1..0....0..1....1..0....0..1....0..1....1..0....0..1
...
..1..0....1..1
..1..0....1..1
..1..0....1..1
..0..1....1..1
..0..1....1..1
..0..1....1..1
CROSSREFS
Column 1 is A067209
Row 2 is twice A112849
Sequence in context: A303140 A103178 A173300 * A280684 A322671 A087909
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Oct 10 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)