189924

Appears in sequences

• a(n) = n*(n + 1)*(n + 2)*(n + 3)*(n^2 - n + 5)/120.at n=15A256860
• Triangle read by rows: T(n,k) = binomial(n+1,k+1) * binomial(5*n-4*k+1,k) / (n+1), 0<=k<=n.at n=41A391048