49908domain: NAppears in sequencesNumber of bipartite partitions of n white objects and 5 black ones.at n=17A000491Generalized Catalan Numbers x^2*A(x)^2 -(1-x+x^2+x^3+x^4)*A(x) + 1 =0.at n=19A023421G.f.: A(x) = exp( Sum_{n>=1} [ D^n x(1+x)/(1-x)^3 ]^n/n ), where differential operator D = x*d/dx.at n=6A159598