2250127

Appears in sequences

• a(n) = (n+2)*(a(n-1) - a(n-2)), starting with a(-1)=0 and a(0)=1.at n=10A051403
• Triangle read by rows: T(n,k) = (n+2) * (Sum_{i=k..n} i!) / ((k+2) * k!) for 0 <= k <= n with T(i,j) = 0 if j < 0 or i < j.at n=45A344381