Expansion of g.f. x / reversion(x - x^2 - x^3).

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =-5a(4) =-17a(5) =-64a(6) =-259a(7) =-1098a(8) =-4815a(9) =-21659a(10) =-99385a(11) =-463385a(12) =-2189070a(13) =-10455340a(14) =-50402858a(15) =-244929608a(16) =-1198504743a(17) =-5900360016a(18) =-29204546125a(19) =-145244328630a(20) =-725451444795