6330240

Appears in sequences

• E.g.f. x*(1-x)/(1-2*x-x^2+x^3).at n=8A052640
• Array read by downward antidiagonals: A(n,k) = A(n-1,k+1) + 2*(k+1)!*Sum_{j=0..k} A(n-1,j)/j! with A(0,k) = 2*(k+1)!, n >= 0, k >= 0.at n=31A379459