Expansion of e.g.f. x * (tan(x) + sec(x)).

Terms

a(0) =1a(1) =2a(2) =3a(3) =8a(4) =25a(5) =96a(6) =427a(7) =2176a(8) =12465a(9) =79360a(10) =555731a(11) =4245504a(12) =35135945a(13) =313155584a(14) =2990414715a(15) =30460116992a(16) =329655706465