44485

Appears in sequences

• a(n) = Sum_{k=0..n} C(n,k) * C(3*n+k,k).at n=5A156886
• Numbers n such that n and n+-1 have 4 distinct prime factors.at n=1A168628
• 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 vertices in the resulting planar graph.at n=38A367183
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where A(n,k) = Sum_{j=0..n} binomial(n,j) * binomial(k*n+j,j).at n=41A387934