1488384domain: NAppears in sequencesa(n) = (32/2)*(n-1)*(n-2)*(n-3)*(n-4).at n=19A134175a(n) = C(n+5, 5)*(n+3)*(-1)^(n+1)*16/3.at n=15A138331Molecular topological indices of the triangular graphs.at n=17A192849