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

Terms

a(0) =1a(1) =3a(2) =5a(3) =24a(4) =44a(5) =129a(6) =384a(7) =897a(8) =2220a(9) =5706a(10) =15268a(11) =35178a(12) =89829a(13) =212982a(14) =526222a(15) =1294263a(16) =3087570a(17) =7300896a(18) =17726100a(19) =41705904a(20) =98782950a(21) =236059794a(22) =551697495a(23) =1293417672a(24) =3033232130a(25) =7081297146a(26) =16430673765a(27) =38347412562a(28) =88762751808a(29) =204970377366