Expansion of Sum_{k>=1} ((1 + k * x^k)^k - 1).

Terms

a(0) =1a(1) =4a(2) =9a(3) =20a(4) =25a(5) =63a(6) =49a(7) =160a(8) =108a(9) =350a(10) =121a(11) =940a(12) =169a(13) =1225a(14) =1475a(15) =2304a(16) =289a(17) =7560a(18) =361a(19) =8025a(20) =12446a(21) =7139a(22) =529a(23) =58192a(24) =3750a(25) =13858a(26) =61965a(27) =102655a(28) =841a(29) =191181