Dirichlet g.f.: Product_{k>=2} 1 / (1 - k^(-s))^(k^4).

Terms

a(0) =1a(1) =16a(2) =81a(3) =392a(4) =625a(5) =2592a(6) =2401a(7) =9008a(8) =9882a(9) =20000a(10) =14641a(11) =73224a(12) =28561a(13) =76832a(14) =101250a(15) =202660a(16) =83521a(17) =368064a(18) =130321a(19) =565000a(20) =388962a(21) =468512a(22) =279841a(23) =1901232a(24) =586250a(25) =913952a(26) =1154763a(27) =2170504a(28) =707281a(29) =4050000