login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147166 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1101-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 47, 123, 369, 1165, 4187, 18445, 79415, 399577, 2091817, 12535539, 80500731 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.0.1.0.0
.0.0.0.1.0.1.1.0.0
.0.0.0.1.1.1.0.1.1
.0.1.1.0.0.0.1.1.0
.0.0.1.0.0.0.1.0.0
.0.1.1.0.0.0.1.1.0
.1.1.0.1.1.1.0.0.0
.0.0.1.1.0.1.0.0.0
.0.0.1.0.0.0.0.0.0
CROSSREFS
Sequence in context: A146175 A146851 A146260 * A146192 A147265 A272705
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 December 7 18:23 EST 2023. Contains 367660 sequences. (Running on oeis4.)