Product_{n>=1} (1 + a(n)*x^n) = 1 + x + x^2 + 2 * Sum_{n>=3} a(n)*x^n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =8a(7) =17a(8) =38a(9) =84a(10) =192a(11) =438a(12) =1024a(13) =2388a(14) =5678a(15) =13451a(16) =32354a(17) =77578a(18) =188382a(19) =456006a(20) =1115966a(21) =2722174a(22) =6702450a(23) =16458698a(24) =40734862a(25) =100551658a(26) =249995010a(27) =619974654a(28) =1547115954a(29) =3852068670