2434320

Appears in sequences

• a(n) = (Lucas(2*n) - Lucas(n))/2.at n=16A049681
• E.g.f.: 1/[ Sum_{n>=0} (-x)^(n*(n+1)/2) / A000178(n) ] where A000178(n) = Product_{k=1..n} k!.at n=9A198892
• Expansion of e.g.f. (1+x) * exp(x^2*(1+x)^2).at n=9A387969