E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=12.

A141008

E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=12.

Terms

    a(0) =1a(1) =6a(2) =64a(3) =930a(4) =16780a(5) =356922a(6) =8681380a(7) =236739354a(8) =7135453180a(9) =235079261562

External references