Reversion of y - y^2 - y^3 + y^5.

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =10a(5) =37a(6) =147a(7) =610a(8) =2616a(9) =11500a(10) =51546a(11) =234689a(12) =1082393a(13) =5046167a(14) =23742030a(15) =112589232a(16) =537589895a(17) =2582351997a(18) =12470621690a(19) =60508557435a(20) =294841397025