G.f. satisfies A(x) = (1 + x*A(x))^3 * (1 + x^2*A(x)^3).
A274379
G.f. satisfies A(x) = (1 + x*A(x))^3 * (1 + x^2*A(x)^3).
Terms
- a(0) =1a(1) =3a(2) =13a(3) =70a(4) =429a(5) =2842a(6) =19794a(7) =142758a(8) =1056655a(9) =7980280a(10) =61251261a(11) =476387379a(12) =3746317414a(13) =29738316330a(14) =237968639936
External references
- oeis: A274379