1027320

Appears in sequences

• Number of length-5 0..n arrays with no repeated value differing from the previous repeated value by other than one.at n=14A269539
• a(n) = Sum_{k=0..n} (-1)^k * (3*k+1) * binomial(4*n-k+1,n-k)/(4*n-k+1).at n=9A390500