Expansion of Product_{n>=1} 1/(1 + 4*x^n)^(1/2).

Terms

a(0) =1a(1) =-2a(2) =4a(3) =-18a(4) =66a(5) =-230a(6) =832a(7) =-3118a(8) =11764a(9) =-44374a(10) =168476a(11) =-643974a(12) =2470506a(13) =-9503946a(14) =36666736a(15) =-141824034a(16) =549717490a(17) =-2134650662a(18) =8303024092a(19) =-32343942934a(20) =126161860886a(21) =-492703658930