E.g.f. tan(x)*exp(x).

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =12a(5) =41a(6) =142a(7) =685a(8) =3192a(9) =19921a(10) =116282a(11) =887765a(12) =6219972a(13) =56126201a(14) =458790022a(15) =4776869245a(16) =44625674352a(17) =526589630881