458880

Appears in sequences

• a(n) = 5^(n-1/2) * (2*n-1)!! * Integral_{x = 0..1/2} 1/(1+x^2)^(n + 1/2) dx.at n=4A090598
• Triangle T(n,k): vertex labeled disconnected Goldstone diagrams with n interactions and k external potentials.at n=16A328922