Expansion of e.g.f. log(cosh(x) + arcsin(x)).

Terms

a(0) =0a(1) =1a(2) =0a(3) =0a(4) =0a(5) =8a(6) =-48a(7) =392a(8) =-2240a(9) =20096a(10) =-147200a(11) =1754368a(12) =-16873472a(13) =241340032a(14) =-2769127424a(15) =44833033216a(16) =-593918959616