211823800domain: NAppears in sequencesG.f.: 3/(1 + 2*sqrt(1-12*x)).at n=9A035610Duplicate of A035610.at n=9A089023Expansion of c(3*x^2)/(1-x*c(3*x^2)), c(x) the g.f. of A000108.at n=18A128386Cogrowth function of the group Baumslag-Solitar(9,9).at n=9A229651Cogrowth function of the group Baumslag-Solitar(10,10).at n=9A229652