E.g.f.: log(sec(x) + arcsin(x)).

Terms

a(0) =0a(1) =1a(2) =0a(3) =0a(4) =4a(5) =-12a(6) =72a(7) =-168a(8) =544a(9) =8144a(10) =-91520a(11) =1384768a(12) =-11984128a(13) =149032128a(14) =-1158162432a(15) =16299168896a(16) =-125837340672