OFFSET
1,2
COMMENTS
Moebius transform of A002293.
MATHEMATICA
Table[Sum[MoebiusMu[n/d] Binomial[4 d, d]/(3 d + 1), {d, Divisors[n]}], {n, 23}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Aug 08 2021
STATUS
approved