%I #13 Nov 08 2015 08:50:30
%S 1,-1,1,3,-38,234,-586,-9493,194906,-1981880,4724642,301409600,
%T -7840250579,102256372812,-9254171165,-39936103724491,
%U 1199830608004118,-17733202003472076,-96125957089130420
%N Exponential reversion of partitions into distinct parts A000009.
%H N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>
%H <a href="/index/Res#revert">Index entries for reversions of series</a>
%t length = 20; Range[length]! InverseSeries[Sum[PartitionsQ[n] x^n/n!, {n, 1, length}] + O[x]^(length+1)][[3]] (* _Vladimir Reshetnikov_, Nov 07 2015 *)
%Y Cf. A050393.
%K sign
%O 1,4
%A _Christian G. Bower_, Nov 15 1999