1348730880domain: NAppears in sequencesTriangle giving a(n,k) = number of k-colored labeled graphs with n nodes.at n=24A046860a(n) = coefficient of sqrt(2) in the expansion of (1 + sqrt(2) + sqrt(3))^n.at n=16A188571Number of labeled graphs on n vertices that can be colored using exactly 4 colors.at n=6A224068