591901884

Appears in sequences

• Number of signed graphs with n nodes. Also number of 2-multigraphs on n nodes.at n=8A004102
• Table T(n,k) giving number of k-multigraphs on n nodes (n >= 1, k >= 0) read by antidiagonals.at n=52A063841
• Array read by descending antidiagonals: A(n,k) is the number of unoriented colorings of the edges of a regular n-dimensional simplex using up to k colors.at n=42A327084