The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A141511 Number of n X n binary matrices, symmetric about both diagonal and antidiagonal, with no more than 3 ones in any 2 X 2 subblock. 1
1, 2, 3, 13, 40, 313, 1833, 27784, 312227, 9039597, 194485968, 10791499905, 444739929613, 47257907376576, 3730171679762583, 759195182636849001, 114775951820515671520, 44741688449064266073777 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A347537 A289549 A259261 * A235615 A117528 A264042
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 May 22 19:48 EDT 2024. Contains 372758 sequences. (Running on oeis4.)