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!)
A146417 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 4, 7, 14, 21, 51, 123, 453, 1219, 4641, 13599, 63683, 242234, 1440301, 6546459, 44699492, 239296946, 1977082524, 12922743339, 130202512826, 1020385455911, 12242346882334 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.1.0.0.0
.0.0.1.1.1.1.0.0.0
.0.1.0.0.0.1.0.0.0
.0.1.0.0.0.0.1.1.1
.0.1.0.0.0.0.0.1.0
.1.1.1.0.0.0.0.1.0
.0.0.0.1.0.0.0.1.0
.0.0.0.1.1.1.1.0.0
.0.0.0.1.0.0.0.0.0
CROSSREFS
Sequence in context: A201272 A147440 A146678 * A008370 A291877 A048241
KEYWORD
nonn
AUTHOR
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 28 14:13 EDT 2024. Contains 371254 sequences. (Running on oeis4.)