89390

Appears in sequences

• a(n) = Sum_{k=0..n} (k+1) * A026747(n, n-k).at n=12A027228
• Number of evolutionary duplication-loss-histories of the complete binary species tree with 8 leaves.at n=3A307942
• Table read by antidiagonals: Place k points in general position on each side of a regular n-gon and join every pair of the n*(k+1) boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives number of edges in the resulting planar graph.at n=38A367190