154732801domain: NAppears in sequencesNumber of colored labeled n-node graphs with 2 interchangeable colors.at n=8A000684E.g.f.: Sum_{n>=0} x^n * cosh(2^n*x) / n!.at n=9A340451E.g.f.: Sum_{n>=0} x^n * sinh(2^n*x) / n!.at n=8A340452