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• 16:28, 4 April 2014 Christian Barrientos (talk | contribs) uploaded File:GracefulTriangle.txt.txt (The entries in this sequence correspond to the number g(n,k) of gracefully labeled graphs with n edges that do not use the label k. g(n,k)=(n-2)!(n-1-k)k if 1 <= k <= floor(n/2) or g(n,k)=(n-2)!(n-k)(k-1) if ceiling((n+1)/2) <= k <= n-1. )