71583

Appears in sequences

• Number of subsets of {1, ..., n} with no four terms in arithmetic progression.at n=18A066369
• a(n) = 100*n^2 - 49*n + 6.at n=26A157651
• Triangle read by rows: T(n,k) is the number of weakly connected oriented graphs on n unlabeled nodes with k arcs, n >= 1, k = 0..n*(n-1)/2.at n=51A350734
• Triangle read by rows: T(n,k) is the number of unlabeled weakly connected oriented graphs with n arcs and k vertices, k = 1..n+1.at n=61A350914