Reversion of y - y^2 - y^4 + y^5.

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =6a(5) =19a(6) =63a(7) =220a(8) =795a(9) =2942a(10) =11099a(11) =42536a(12) =165126a(13) =647955a(14) =2565946a(15) =10241616a(16) =41158598a(17) =166402323a(18) =676338003a(19) =2761988994a(20) =11327162406a(21) =46631572295a(22) =192638451780a(23) =798316442580