Reversion of x - x^2 - x^6.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =43a(6) =140a(7) =474a(8) =1650a(9) =5863a(10) =21170a(11) =77441a(12) =286372a(13) =1068790a(14) =4020704a(15) =15230470a(16) =58044354a(17) =222401745a(18) =856235030a(19) =3310615055a(20) =12849946406a(21) =50051007940a(22) =195571906140a(23) =766413504375