a(n) = Sum_{d|n} mu(n/d) * binomial(7*d,d) / (6*d+1).
A346938
a(n) = Sum_{d|n} mu(n/d) * binomial(7*d,d) / (6*d+1).
Terms
- a(0) =1a(1) =6a(2) =69a(3) =812a(4) =10471a(5) =141702a(6) =1997687a(7) =28988856a(8) =430321563a(9) =6503342378a(10) =99726673129
External references
- oeis: A346938