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!)
A211104 1/4 the number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having two or three distinct values 0

%I

%S 15,795,150501,101638401,244923340737,2105900715375957,

%T 64607710656824916891,7072434599436128908889787,

%U 2762433091820721094887987355053,3849929838909014980590084143791140141

%N 1/4 the number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having two or three distinct values

%e Some solutions for n=3

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 31 2012

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 26 15:01 EST 2022. Contains 350599 sequences. (Running on oeis4.)