%I #7 Mar 30 2012 17:21:00
%S 0,1,1,2,4,7,7,-20,-177,-842,-3245,-10920,-32396,-81781,-151606,
%T -32368,1528436,10115847,46911627,182321874,618736524,1821588615,
%U 4363335060,6280838340,-12403999335,-158989515204,-893044400094,-3912400187584
%N Reversion of y - y^2 + y^4 + y^5.
%H <a href="/index/Res#revert">Index entries for reversions of series</a>
%t CoefficientList[InverseSeries[Series[y - y^2 + y^4 + y^5, {y, 0, 30}], x], x]
%K sign,easy
%O 0,4
%A _Olivier GĂ©rard_, Jul 05 2001.