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!)
A146385 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,2,3,6,11,18,47,140,456,1541,4859,19189,88716,477610,

%T 2733493,16377324,107101430,821473645,7043526337,68487711150,

%U 704897480220,8110505465029,102402264000312,1483223734585349,23560655031075409

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.1.1.1.1.0.0

%e .0.1.0.1.1.0.1.0

%e .0.1.1.0.0.1.1.0

%e .0.1.1.0.0.1.1.0

%e .0.1.0.1.1.0.1.0

%e .0.0.1.1.1.1.0.0

%e .0.0.0.0.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_

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 07:48 EDT 2024. Contains 371235 sequences. (Running on oeis4.)