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

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-3a(4) =5a(5) =-8a(6) =12a(7) =-21a(8) =37a(9) =-59a(10) =92a(11) =-153a(12) =256a(13) =-409a(14) =654a(15) =-1073a(16) =1754a(17) =-2824a(18) =4552a(19) =-7394a(20) =12010a(21) =-19406a(22) =31337a(23) =-50782a(24) =82306a(25) =-133072a(26) =215152a(27) =-348346a(28) =563939a(29) =-912217