G.f.: Re((2*i; x)_inf), where (a; q)_inf is the q-Pochhammer symbol, i = sqrt(-1).

Terms

a(0) =1a(1) =-4a(2) =-4a(3) =-8a(4) =-8a(5) =-12a(6) =4a(7) =0a(8) =16a(9) =28a(10) =60a(11) =72a(12) =120a(13) =148a(14) =212a(15) =192a(16) =272a(17) =268a(18) =316a(19) =264a(20) =264a(21) =116a(22) =84a(23) =-176a(24) =-368a(25) =-788a(26) =-1140a(27) =-1848a(28) =-2168a(29) =-3164