109361domain: NAppears in sequencesExpansion of g.f.: (1-3*x*C)/(1-4*x*C) where C = (1 - sqrt(1-4*x))/(2*x) = g.f. for Catalan numbers A000108.at n=8A076025Riordan array (1/(1-4*x*c(x)),xc(x)), c(x) the g.f. of A000108.at n=37A117380