657270374400
domain: N
Appears in sequences
- a(n) = 2^n * (2*n)! / (n!)^2.at n=14A059304
- Number of rooted unicursal planar maps with n edges and exactly one vertex of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).at n=14A069722
- Expansion of (sqrt(1-8*x^2)+8*x^2+2*x-1)/(2*x*sqrt(1-8*x^2)).at n=28A103973
- Series expansion of 1/sqrt(8*x^2 + 1), even powers only.at n=14A343842