Expansion of e.g.f. exp(x)*(tan x + sec x)^3.

Terms

a(0) =1a(1) =4a(2) =16a(3) =67a(4) =304a(5) =1519a(6) =8386a(7) =51007a(8) =340024a(9) =2469859a(10) =19438606a(11) =164899447a(12) =1500636844a(13) =14587478299a(14) =150891959026