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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =10a(6) =15a(7) =23a(8) =34a(9) =50a(10) =71a(11) =100a(12) =140a(13) =195a(14) =268a(15) =363a(16) =487a(17) =650a(18) =865a(19) =1145a(20) =1505a(21) =1962a(22) =2541a(23) =3275a(24) =4208a(25) =5390a(26) =6879a(27) =8740a(28) =11053a(29) =13917