189190144

Appears in sequences

• a(n) = 2^n * (2*n)! / (n!)^2.at n=10A059304
• 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=10A069722
• E.g.f. BesselI(0,2*sqrt(2)*x) + BesselI(1,2*sqrt(2)*x)/sqrt(2).at n=20A098660
• Expansion of (sqrt(1-8*x^2)+8*x^2+2*x-1)/(2*x*sqrt(1-8*x^2)).at n=20A103973
• Number of 10-D hypercubes in an n-dimensional hypercube.at n=10A172242
• 10-quantum transitions in systems of N >= 10 spin 1/2 particles, in columns by combination indices.at n=30A213352
• Series expansion of 1/sqrt(8*x^2 + 1), even powers only.at n=10A343842