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!)
A141508 Number of n X n binary matrices, symmetric under 180 degree rotation, with no more than 2 ones in any 2 X 2 subblock. 0
1, 2, 3, 19, 93, 1575, 21225, 1007325, 39296735, 5294789855, 584025270873, 223173910768577, 70041418150889563, 76024730608891641301, 67725956302664583147084, 208747768532396398250753135, 528233319697505378983008951127 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A262957 A072263 A009178 * A366357 A119344 A072877
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 10 2008
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 19 07:21 EDT 2024. Contains 370955 sequences. (Running on oeis4.)