75415domain: NAppears in sequencesNumber of graphs with n nodes and n+2 edges.at n=7A048180G.f.: x(2-5x-2x^2)/(1-6x+9x^2-x^4).at n=10A106438Table, by rows, of T(k,n) the number of simple graphs on v = prime(n) vertices and with e = prime(k) edges.at n=19A182043