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!)
A192640 Number of n X n symmetric 0..3 arrays with each element equal to at least one horizontal or vertical neighbor and any new values 0..3 introduced in lower triangular row major order 0

%I

%S 0,1,5,137,15055,5986313,7174532375,25969938730579,281423389721323932,

%T 9146849687492666154781,891167854920321677292610251

%N Number of n X n symmetric 0..3 arrays with each element equal to at least one horizontal or vertical neighbor and any new values 0..3 introduced in lower triangular row major order

%e Some solutions for 6X6 containing a 3

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

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

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Jul 06 2011

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 May 26 11:08 EDT 2022. Contains 354086 sequences. (Running on oeis4.)