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!)
A210897 Number of (2n)X(2n) 0..2 symmetric matrices with every element equal to two horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order 0

%I #4 Mar 31 2012 12:37:34

%S 1,3,35,792,34547,2902490,468761578,145469326676,86673425993599

%N Number of (2n)X(2n) 0..2 symmetric matrices with every element equal to two horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order

%e All solutions for n=2

%e ..0..0..0..0....0..0..1..1....0..0..1..1

%e ..0..1..1..0....0..0..1..1....0..0..1..1

%e ..0..1..1..0....1..1..2..2....1..1..0..0

%e ..0..0..0..0....1..1..2..2....1..1..0..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 29 2012

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 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)