49315

Appears in sequences

• Triangle: T(n,k) equals the coefficient of x^n*y^k in the n-th iteration of x*(1+xy)/(1-x), for n>=1, 0<=k<n, as read by rows.at n=17A185755
• Column 2 of triangle A185755.at n=3A185757
• Number of n edge connected achiral planar maps with an external face in which all internal faces are triangles.at n=25A378342