Expansion of e.g.f. exp(x)*tan(2*x)/2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =11a(4) =36a(5) =341a(6) =1702a(7) =23071a(8) =154056a(9) =2691241a(10) =22470602a(11) =479886131a(12) =4808343276a(13) =121361260541