Expansion of (1/2) * Sum_{k>0} (2 * x * (1 + x^k))^k.

Terms

a(0) =1a(1) =3a(2) =4a(3) =12a(4) =16a(5) =46a(6) =64a(7) =160a(8) =268a(9) =592a(10) =1024a(11) =2292a(12) =4096a(13) =8640a(14) =16544a(15) =33824a(16) =65536a(17) =133856a(18) =262144a(19) =529576a(20) =1049920a(21) =2108416a(22) =4194304a(23) =8417408a(24) =16777296a(25) =33607680a(26) =67118080a(27) =134334656a(28) =268435456a(29) =537140208