157120

Appears in sequences

• Derangement numbers d(n,4) where d(n,k) = k(n-1)(d(n-1,k) + d(n-2,k)), with d(0,k) = 1 and d(1,k) = 0.at n=6A088991
• Number of length-5 0..n arrays with no adjacent pair x,x+1 followed at any distance by x+1,x.at n=9A268459
• a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(k,n-3*k)^2.at n=24A387477