Expansion of e.g.f. exp(tanh(log(1+x))).

Terms

a(0) =1a(1) =1a(2) =0a(3) =-2a(4) =4a(5) =6a(6) =-74a(7) =190a(8) =1128a(9) =-14336a(10) =51616a(11) =404856a(12) =-7330520a(13) =41023048a(14) =250083744a(15) =-7532037344a(16) =65189204416a(17) =185746926720