Expansion of tanh(log(1+1/x)).

Terms

a(0) =1a(1) =0a(2) =-4a(3) =24a(4) =-96a(5) =0a(6) =5760a(7) =-80640a(8) =645120a(9) =0a(10) =-116121600a(11) =2554675200a(12) =-30656102400a(13) =0a(17) =0a(21) =0