47944

Appears in sequences

• a(n) = (n+1) a(n-1) + (-1)^n.at n=7A006347
• 4th binomial transform of (0,1,0,2,0,4,0,8,0,16,...).at n=7A081180
• Triangle read by rows: T(n,k) = n * T(n-1,k) + (-1)^(n-k) for 0 <= k <= n with initial values T(n,k) = 0 if n < 0 or k < 0 or k > n.at n=48A352650
• a(n) is the sum of the squares of the area under Dyck paths of length 2*n.at n=6A367780