Series reversion of x*(1-x-2*x^2)/(1-x).

Terms

a(0) =0a(1) =1a(2) =0a(3) =2a(4) =2a(5) =14a(6) =30a(7) =146a(8) =434a(9) =1862a(10) =6470a(11) =26586a(12) =99946a(13) =406366a(14) =1593774a(15) =6492450a(16) =26100578a(17) =106979894a(18) =436906902a(19) =1803472874a(20) =7446478746a(21) =30945624910a(22) =128821054846a(23) =538584390834