G.f. satisfies: A(x) = (1 + x*A(x)^3)*(1 + x^2*A(x)^3).
A199876
G.f. satisfies: A(x) = (1 + x*A(x)^3)*(1 + x^2*A(x)^3).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =19a(4) =103a(5) =604a(6) =3728a(7) =23866a(8) =157015a(9) =1055121a(10) =7211227a(11) =49970893a(12) =350283538a(13) =2479386646a(14) =17696379769a(15) =127220129807a(16) =920376055978
External references
- oeis: A199876