E.g.f. sin(x) + cos(x) + tan(x).

Terms

a(0) =1a(1) =2a(2) =-1a(3) =1a(4) =1a(5) =17a(6) =-1a(7) =271a(8) =1a(9) =7937a(10) =-1a(11) =353791a(12) =1a(13) =22368257a(14) =-1a(15) =1903757311a(16) =1a(17) =209865342977a(18) =-1a(20) =1a(22) =-1a(24) =1a(26) =-1a(28) =1