1373680

Appears in sequences

• Triangular array read by rows. T(n,k) is the number of 2-colored labeled graphs on n nodes with exactly k edges; n >= 0, 0 <= k <= A002620(n).at n=51A228890
• Irregular triangular array read by rows: T(n,k) is the number of 2-colored simple labeled graphs on n nodes that have exactly k edges, 0<=k<=A002620(n), n>=1.at n=50A241669
• G.f. A(x) satisfies: x = A(x)-2*A(x)^2-2*A(x)^3.at n=8A276310