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

Terms

a(0) =1a(1) =-8a(2) =24a(3) =-72a(4) =344a(5) =-1416a(6) =5400a(7) =-21576a(8) =87000a(9) =-348296a(10) =1390872a(11) =-5560776a(12) =22253784a(13) =-89025672a(14) =356055960a(15) =-1424186568a(16) =5696931032a(17) =-22787865096a(18) =91150729368a(19) =-364602357960