Reversion of y - y^2 - y^3 - y^4 - y^5.

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =11a(5) =45a(6) =196a(7) =894a(8) =4215a(9) =20377a(10) =100463a(11) =503191a(12) =2553291a(13) =13097469a(14) =67808104a(15) =353851124a(16) =1859313324a(17) =9828998946a(18) =52237988523a(19) =278952216129