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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =0a(4) =6a(5) =-22a(6) =-30a(7) =952a(8) =-5656a(9) =-9952a(10) =508320a(11) =-3874992a(12) =-20690208a(13) =833780400a(14) =-7697940432a(15) =-52230156288