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!)
A146175 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-100-111 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,1,5,13,25,45,121,385,1395,5901,28053,137719,714777,

%T 4090907,28017605,214429525,1879119265,18054271787,200571323617

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-100-111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.1.0.0

%e .0.0.0.1.0.1.0.0

%e .0.0.0.1.0.0.1.1

%e .1.1.1.0.0.0.0.1

%e .1.0.0.0.0.1.1.1

%e .1.1.0.0.1.0.0.0

%e .0.0.1.0.1.0.0.0

%e .0.0.1.1.1.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Oct 27 2008

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 February 26 15:44 EST 2024. Contains 370352 sequences. (Running on oeis4.)