E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=8.

A141005

E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=8.

Terms

    a(0) =1a(1) =4a(2) =31a(3) =329a(4) =4316a(5) =66543a(6) =1172077a(7) =23139068a(8) =504673027a(9) =12023659317a(10) =310112290044

External references