G.f.: q-Cosh(x,q)^2 - q-Sinh(x,q)^2 at q=-x.

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-2a(4) =-2a(5) =-2a(6) =-1a(7) =2a(8) =5a(9) =6a(10) =7a(11) =10a(12) =12a(13) =8a(14) =-1a(15) =-8a(16) =-11a(17) =-16a(18) =-26a(19) =-38a(20) =-50a(21) =-58a(22) =-52a(23) =-30a(24) =-8a(25) =0a(26) =4a(27) =24a(28) =63a(29) =112