OFFSET
1,7
FORMULA
EXAMPLE
a(16) = 5. The 5 partitions of 16 are (1,15), (3,13), (4,12), (5,11), and (6,10).
MATHEMATICA
Table[Sum[KroneckerDelta[MoebiusMu[k], MoebiusMu[n - k]], {k, Floor[(n - 1)/2]}], {n, 100}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wesley Ivan Hurt, May 04 2023
STATUS
approved