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!)
A146573 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-0100-1111 pattern in any orientation. 0
1, 1, 1, 1, 3, 9, 27, 93, 387, 2257, 17737, 161709, 1791979, 24472267, 411254805, 8803299545, 237567838361, 7943030744455, 326428801034421, 16521809851219021, 1042915737664638031 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.1.1.1.1.0.0.0
.1.0.0.1.0.0.0.0
.1.0.0.1.0.0.0.0
.1.1.1.0.0.0.0.1
.1.0.0.0.0.1.1.1
.0.0.0.0.1.0.0.1
.0.0.0.0.1.0.0.1
.0.0.0.1.1.1.1.0
CROSSREFS
Sequence in context: A328080 A148925 A148926 * A148927 A148928 A029527
KEYWORD
nonn
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 March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)