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

Terms

a(0) =1a(1) =4a(2) =9a(3) =26a(4) =25a(5) =72a(6) =49a(7) =148a(8) =126a(9) =200a(10) =121a(11) =522a(12) =169a(13) =392a(14) =450a(15) =843a(16) =289a(17) =1152a(18) =361a(19) =1450a(20) =882a(21) =968a(22) =529a(23) =3420a(24) =950a(25) =1352a(26) =1623a(27) =2842a(28) =841a(29) =4500