40784domain: NAppears in sequencesNumber of non-unitary divisors of n!.at n=19A048657Numbers n such that the last 9 decimal digits of the n-th Fibonacci number is pandigital 1-9.at n=10A112371G.f. satisfies: A(x) = (1-x^2) * (1 + x*A(x)^2).at n=13A259206