3573805950domain: NAppears in sequencesNumber of 9-ary trees.at n=9A059967Eighth column of triangle A062993 (without leading zeros). A Pfaff-Fuss or 9-Raney sequence.at n=9A062994a(n) = binomial(n^2, n)/(1+(n-1)*n).at n=9A091144G.f. A(x) satisfies A(x) = 1 + x*A(x)^5*A(-x)^4.at n=18A143554