E.g.f.: Product_{k>=1} (1 + x^(3*k-2)/(3*k-2)) / (1 - x^(3*k-2)/(3*k-2)).

A326861

E.g.f.: Product_{k>=1} (1 + x^(3*k-2)/(3*k-2)) / (1 - x^(3*k-2)/(3*k-2)).

Terms

    a(0) =1a(1) =2a(2) =4a(3) =12a(4) =60a(5) =360a(6) =2160a(7) =16560a(8) =149040a(9) =1386720a(10) =14592960a(11) =174208320a(12) =2173897440a(13) =29413264320a(14) =437473872000

External references