Expansion of 1/(1 - x) * Product_{k>=0} 1/(1 - x^(4^k))^(4^(k+1)).

Terms

a(0) =1a(1) =5a(2) =15a(3) =35a(4) =86a(5) =206a(6) =450a(7) =890a(8) =1751a(9) =3411a(10) =6401a(11) =11405a(12) =20076a(13) =35036a(14) =59876a(15) =99156a(16) =162345a(17) =263821a(18) =422871a(19) =663691a(20) =1031914a(21) =1594610a(22) =2440286a(23) =3678886a(24) =5504759a(25) =8196659a(26) =12117745a(27) =17715581a(28) =25744904a(29) =37267624