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

Terms

a(0) =1a(1) =2a(2) =1a(3) =6a(4) =3a(5) =6a(6) =16a(7) =12a(8) =16a(9) =22a(10) =51a(11) =36a(12) =60a(13) =62a(14) =91a(15) =154a(16) =148a(17) =176a(18) =236a(19) =278a(20) =328a(21) =552a(22) =508a(23) =670a(24) =771a(25) =988a(26) =1068a(27) =1438a(28) =1844a(29) =1998