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A346939
a(n) = Sum_{d|n} mu(n/d) * binomial(8*d,d) / (7*d+1).
4
1, 7, 91, 1232, 18277, 285285, 4638347, 77650784, 1329890613, 23190011435, 410333440535, 7349042707872, 132969010888279, 2426870701777445, 44627576949345735, 826044435331747776, 15378186970730687399, 287756293702214647875, 5409093674555090316299, 102094541350713952736608
OFFSET
1,2
COMMENTS
Moebius transform of A007556.
MATHEMATICA
Table[Sum[MoebiusMu[n/d] Binomial[8 d, d]/(7 d + 1), {d, Divisors[n]}], {n, 20}]
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Aug 08 2021
STATUS
approved