258805669

Appears in sequences

• Expansion of e.g.f. cos(x)/(1+x).at n=12A009102
• a(n) = (2*n)!*Sum_{k = 0..n} (-1)^k/(2*k)!.at n=6A275651
• a(n) = n! * Sum_{k=0..floor(n/2)} (-1)^k / (n-2*k)!.at n=12A337749
• a(n) is the numerator of Sum_{k=0..n} (-1)^k / (2*k)!.at n=6A354138