Expansion of e.g.f. log(sec(x)+arctanh(x)).

Terms

a(0) =0a(1) =1a(2) =0a(3) =1a(4) =0a(5) =13a(6) =-48a(7) =677a(8) =-4480a(9) =54937a(10) =-471680a(11) =6248713a(12) =-65916928a(13) =988579109a(14) =-12514310144a(15) =212756765101