135451domain: NAppears in sequencesNumerator of the Harary number for the cycle graph C_n.at n=18A160046E.g.f.: Limit_{N->oo} [ Sum_{n>=0} (N^2 + n^2)^n * (x/N)^n/n! ]^(1/N).at n=7A318633a(n) is the numerator of the asymptotic density of numbers divisible by their last digit in base n.at n=12A341431