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

A326860

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

Terms

    a(0) =1a(1) =0a(2) =2a(3) =0a(4) =12a(5) =48a(6) =180a(7) =2016a(8) =15120a(9) =72576a(10) =1424304a(11) =11249280a(12) =113164128a(13) =2066238720a(14) =22751977248a(15) =303261573888

External references