-1108536

Appears in sequences

• Expansion of (1-4*x)^(19/2).at n=7A020931
• G.f. C(x) satisfies C(x)^(1/2) - S(x)^(1/2) = 1 such that C'(x)*S(x)^(1/2) = S'(x)*C(x)^(1/2) = 72*x.at n=9A299853