387538588domain: NAppears in sequencesa(n) = Sum_{d|n} d^n * binomial(d+n/d-2, d-1).at n=8A338661a(n) = Sum_{d|n} (-1)^(d-1) * (n/d)^n * binomial(d+n/d-2, d-1).at n=8A338689