Product_{n>=1} (1 + x^n)^a(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) =85a(10) =194a(11) =448a(12) =1046a(13) =2462a(14) =5844a(15) =13953a(16) =33516a(17) =80909a(18) =196222a(19) =477807a(20) =1167850a(21) =2863987a(22) =7045268a(23) =17379771a(24) =42985148a(25) =106568739a(26) =264791172a(27) =659278031a(28) =1644614824a(29) =4109924774