1140623domain: NAppears in sequencesTriangle read by rows: T(n,k) = number of graphs on n node with edge chromatic number k (n >= 1, k >= 1).at n=54A123962Number of graphs on n nodes with edge chromatic number 5.at n=9A126731a(n) = 2401*n^2 - 980*n + 99.at n=21A157375