70600

Appears in sequences

• a(n) = A026681(2n,n).at n=8A026682
• T(n,[ n/2 ]), T given by A026681.at n=16A026687
• Array read by antidiagonals: Place k points in general position on each side of a regular n-gon and join every pair of the k*n boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of edges in the resulting planar graph.at n=50A392282