E.g.f.: tanh(log(1+x))*cos(x).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-3a(4) =12a(5) =-25a(6) =-15a(7) =623a(8) =-4592a(9) =18909a(10) =17595a(11) =-1233551a(12) =13641276a(13) =-81119597a(14) =-105681667a(15) =10102782675a(16) =-148962722880