G.f. satisfies: A(x*A(x)) = G(x) where G(x) = 1 + x*G(x)^3 is the g.f. of A001764.
A168653
G.f. satisfies: A(x*A(x)) = G(x) where G(x) = 1 + x*G(x)^3 is the g.f. of A001764.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =82a(6) =340a(7) =1478a(8) =6622a(9) =30433a(10) =142331a(11) =676203a(12) =3248579a(13) =15776459a(14) =77196573a(15) =380849394a(16) =1888606247a(17) =9430534212a(18) =47236684433a(19) =238214461960
External references
- oeis: A168653