Expansion of g.f.: exp( Sum_{n>=1} sigma(5*n)*x^n/n ).

Terms

a(0) =1a(1) =6a(2) =27a(3) =98a(4) =315a(5) =917a(6) =2486a(7) =6345a(8) =15427a(9) =35965a(10) =80897a(11) =176296a(12) =373652a(13) =772381a(14) =1561130a(15) =3091476a(16) =6008896a(17) =11480887a(18) =21591830a(19) =40016045a(20) =73157052a(21) =132052382a(22) =235535752a(23) =415433365a(24) =725043875a(25) =1252857043a(26) =2144601961a(27) =3638413830