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!)
A146067 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation. 0

%I

%S 1,1,1,1,1,1,1,5,9,17,41,117,275,1237,4103,20885,85925,519635,2644535,

%T 20312399,128516271,1266040749,10025925703,122157386121,1211481473503,

%U 18256047371395,225812595799851,4272679708033791,65914771408101775

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.0.0

%e .0.0.0.1.1.1.0.0

%e .0.0.0.1.0.0.1.1

%e .0.1.1.0.0.0.1.0

%e .0.1.0.0.0.1.1.0

%e .1.1.0.0.1.0.0.0

%e .0.0.1.1.1.0.0.0

%e .0.0.1.0.0.0.0.0

%K nonn

%O 1,8

%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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 2 21:10 EST 2023. Contains 360024 sequences. (Running on oeis4.)