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!)
A146646 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 7, 13, 27, 41, 115, 303, 1555, 4709, 23865, 76741, 449473, 1923409, 15857735, 84725491 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.0.0.1.0.0.0.0.0
.0.0.0.1.1.1.1.0.0
.0.0.0.1.0.1.0.1.0
.1.1.1.0.0.0.1.1.0
.0.1.0.0.0.0.0.1.0
.0.1.1.0.0.0.1.1.1
.0.1.0.1.0.1.0.0.0
.0.0.1.1.1.1.0.0.0
.0.0.0.0.0.1.0.0.0
CROSSREFS
Sequence in context: A067870 A147258 A146718 * A096194 A160889 A360357
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 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)