G.f.: exp( Sum_{n>=1} A051064(n)*3^A051064(n)*x^n/n ) where A051064(n) equals the 3-adic valuation of 3n.

A183038

G.f.: exp( Sum_{n>=1} A051064(n)*3^A051064(n)*x^n/n ) where A051064(n) equals the 3-adic valuation of 3n.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =15a(4) =30a(5) =51a(6) =93a(7) =156a(8) =240a(9) =387a(10) =597a(11) =870a(12) =1311a(13) =1920a(14) =2697a(15) =3873a(16) =5448a(17) =7422a(18) =10278a(19) =14016a(20) =18636a(21) =25098a(22) =33402a(23) =43548a(24) =57333a(25) =74757a(26) =95820a(27) =123780a(28) =158637a(29) =200391

External references