G.f. satisfies: x = A(x) * (1 - A(x)) / (1 - A(x) - A(x)^3) such that A(0) = 1.

A243156

G.f. satisfies: x = A(x) * (1 - A(x)) / (1 - A(x) - A(x)^3) such that A(0) = 1.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =9a(4) =28a(5) =92a(6) =319a(7) =1154a(8) =4302a(9) =16382a(10) =63391a(11) =248499a(12) =984867a(13) =3940121a(14) =15891386a(15) =64545971a(16) =263783729a(17) =1083883910a(18) =4475194635a(19) =18557356409a(20) =77251869363a(21) =322723617687

External references