|
|
A047940
|
|
Number of 5-colorings of an n X n grid, up to rotational symmetry.
|
|
3
|
|
|
1, 5, 165, 489125, 38147070625, 74505806274453125, 3637978807092666626953125, 4440892098500626236200333251953125, 135525271560688054250937420874834136962890625, 103397576569128459358926086520114040467888355255126953125
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
FORMULA
|
a(n) = (m^(n^2) + 2 m^((n^2 + 3 (n mod 2))/4) + m^((n^2 + (n mod 2))/2))/4, with m = 5.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|