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!)
A146825 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 81, 81, 501, 501, 9765, 9765, 253829, 253829, 5201161, 5201161 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example:
.0.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0.0
.1.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0.0
CROSSREFS
Sequence in context: A294691 A356839 A147172 * A147029 A146258 A146173
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Nov 04 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 June 15 16:55 EDT 2024. Contains 373410 sequences. (Running on oeis4.)