OFFSET
0,2
FORMULA
1/(5n) * sum over d|n of {mu(n/d) * (5d)! / d!^5}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Christian G. Bower, Aug 29 2002
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Aug 24 2015
STATUS
approved