Dirichlet g.f.: Product_{k>=2} 1 / (1 - k^(-s))^(k^7).

Terms

a(0) =1a(1) =128a(2) =2187a(3) =24640a(4) =78125a(5) =559872a(6) =823543a(7) =4552064a(8) =7175547a(9) =20000000a(10) =19487171a(11) =125551296a(12) =62748517a(13) =210827008a(14) =341718750a(15) =818079776a(16) =410338673a(17) =2142910080a(18) =893871739a(19) =4485000000a(20) =3602177082a(21) =4988715776a(22) =3404825447a(23) =26025929856a(24) =9155312500a(25) =16063620352a(26) =22666490820