-21440

Appears in sequences

• a(n) = 2*a(n-1) - 2*(n-2)*a(n-2), with a(0)=1, a(1)=2.at n=10A122033
• E.g.f. satisfies: A(x)^A(-x) = exp(2*x) * A(-x)^A(x).at n=7A275759