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

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =5a(5) =15a(6) =49a(7) =168a(8) =594a(9) =2150a(10) =7931a(11) =29718a(12) =112814a(13) =432957a(14) =1677050a(15) =6547856a(16) =25742454a(17) =101819100a(18) =404885630a(19) =1617725010a(20) =6491294600a(21) =26147434885a(22) =105691660110a(23) =428578242900