Expansion of exp( Sum_{n>=1} sigma_2(3*n)*x^n/n ) in powers of x.

Terms

a(0) =1a(1) =10a(2) =75a(3) =447a(4) =2335a(5) =10977a(6) =47667a(7) =193775a(8) =745819a(9) =2738568a(10) =9653342a(11) =32821384a(12) =108061167a(13) =345622069a(14) =1076767956a(15) =3275039352a(16) =9743874779a(17) =28405248949a(18) =81256123017a(19) =228383836091a(20) =631427595230