66987

Appears in sequences

• Triangle read by rows: T(n,0) = 3^n, T(n,k) = T(n,k-1) + T(n-1,k) for 0 < k < n, and T(n,n) = T(n,n-1).at n=42A165992
• a(n) = (n+1)*(n^3+15*n^2+74*n+132)/12.at n=26A217947