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!)
A156457 Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 12. 0
1, 4, 0, 18, 90, 5154, 19368, 2108280, 31103100, 3164432181, 105602337600, 14188463179758, 817218706478195 (list; graph; refs; listen; history; text; internal format)
OFFSET
3,2
LINKS
CROSSREFS
Sequence in context: A215669 A244310 A334705 * A058348 A184946 A351615
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
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 02:58 EDT 2024. Contains 370952 sequences. (Running on oeis4.)