Expansion of Product_{k>=1} 1/(1 - 2^(k+1)*x^k).

Terms

a(0) =1a(1) =4a(2) =24a(3) =112a(4) =544a(5) =2368a(6) =10624a(7) =44800a(8) =190976a(9) =791552a(10) =3282944a(11) =13414400a(12) =54829056a(13) =222117888a(14) =899383296a(15) =3625123840a(16) =14601027584a(17) =58659700736a(18) =235555782656a(19) =944552017920