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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =17a(6) =33a(7) =67a(8) =133a(9) =256a(10) =488a(11) =935a(12) =1798a(13) =3437a(14) =6507a(15) =12239a(16) =22950a(17) =42959a(18) =80283a(19) =149717a(20) =278338a(21) =515579a(22) =952014a(23) =1753899a(24) =3225529a(25) =5921773a(26) =10852501a(27) =19853341a(28) =36254081a(29) =66082021