G.f. satisfies: A(x) = x^2/(1-x) + Series_Reversion(x - x*A(x)).
A212922
G.f. satisfies: A(x) = x^2/(1-x) + Series_Reversion(x - x*A(x)).
Terms
- a(0) =1a(1) =2a(2) =5a(3) =21a(4) =120a(5) =800a(6) =5881a(7) =46565a(8) =391876a(9) =3473879a(10) =32226510a(11) =311313683a(12) =3119693862a(13) =32333294383a(14) =345754479372
External references
- oeis: A212922