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

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =6a(5) =21a(6) =77a(7) =292a(8) =1143a(9) =4592a(10) =18821a(11) =78364a(12) =330512a(13) =1409149a(14) =6063526a(15) =26298592a(16) =114849110a(17) =504595293a(18) =2228824203a(19) =9891723114a(20) =44087704836a(21) =197255893945a(22) =885630834120