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!)
A146033 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation. 0

%I

%S 1,1,3,7,15,39,189,995,5569,37913,366061,4244909,58320195,974389263,

%T 20855855835,546928072163,17575257415665,693118931384501,

%U 34026835620030291,2054942936198627105,152983262052724174217

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.0.0.1.1.1

%e .1.0.0.0.0.0.0.1

%e .1.0.1.1.1.0.0.1

%e .0.0.1.0.0.0.0.0

%e .0.0.1.0.1.1.1.0

%e .1.0.0.0.1.0.0.1

%e .1.0.0.0.1.0.0.1

%e .1.1.1.0.0.1.1.1

%K nonn

%O 1,3

%A _R. H. Hardin_, Oct 26 2008

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 24 04:47 EST 2022. Contains 350534 sequences. (Running on oeis4.)