Expansion of Product_{k>=1} (1-x^k)*(1+x^k)^4.

Terms

a(0) =1a(1) =3a(2) =5a(3) =10a(4) =17a(5) =26a(6) =43a(7) =65a(8) =95a(9) =140a(10) =201a(11) =283a(12) =395a(13) =545a(14) =740a(15) =1002a(16) =1343a(17) =1780a(18) =2350a(19) =3077a(20) =4002a(21) =5183a(22) =6670a(23) =8535a(24) =10880a(25) =13801a(26) =17426a(27) =21925a(28) =27475a(29) =34297