Expansion of f(x) / f(-x) in powers of x where f() is the g.f. for A007325.

Terms

a(0) =1a(1) =-2a(2) =2a(3) =0a(4) =-2a(5) =2a(6) =0a(7) =0a(8) =-2a(9) =2a(10) =2a(11) =-8a(12) =8a(13) =0a(14) =-8a(15) =8a(16) =-2a(17) =0a(18) =-6a(19) =8a(20) =6a(21) =-24a(22) =24a(23) =0a(24) =-24a(25) =22a(26) =-4a(27) =0a(28) =-16a(29) =20