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!)
A210817 Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having one or three distinct values, and new values 0..3 introduced in lower triangle row major order 0

%I

%S 0,14,784,81546,19331276,10875523234,14610137114552,46893872347639870,

%T 359629516042061730940,6589801210361833609789898

%N Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having one or three distinct values, and new values 0..3 introduced in lower triangle row major order

%e Some solutions for n=3

%e ..0..1..2..3....0..1..0..3....0..1..2..3....0..1..3..2....0..1..2..1

%e ..1..2..3..1....1..2..2..3....1..2..0..0....1..2..1..2....1..2..3..3

%e ..2..3..0..1....0..2..2..0....2..0..1..3....3..1..3..3....2..3..0..1

%e ..3..1..1..3....3..3..0..3....3..0..3..0....2..2..3..3....1..3..1..3

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 27 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 September 30 13:23 EDT 2022. Contains 357105 sequences. (Running on oeis4.)