Expansion of e.g.f. exp(x) * log(sec(x)).

Terms

a(0) =0a(1) =1a(2) =3a(3) =8a(4) =20a(5) =61a(6) =203a(7) =888a(8) =4080a(9) =24001a(10) =140283a(11) =1028048a(12) =7248020a(13) =63374221a(14) =522164243a(15) =5299033488a(16) =49924707840a(17) =576514338721