|
|
A056502
|
|
Number of primitive (period n) periodic palindromes using exactly six different symbols.
|
|
2
|
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 360, 720, 7920, 15120, 103320, 191520, 1048320, 1905120, 9170280, 16435440, 72832680, 129230640, 541129320, 953029440, 3832179120, 6711344640, 26192751480, 45674188560, 174286569240, 302899156560, 1136022947280, 1969147121760
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,10
|
|
REFERENCES
|
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
|
|
LINKS
|
|
|
FORMULA
|
a(n) = Sum_{d|n} mu(d)*A056492(n/d).
|
|
EXAMPLE
|
For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|