138244

Appears in sequences

• [ 4th elementary symmetric function of sqrt(k+1) ], k = 1,2,...,n.at n=12A025221
• Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and having abscissa of first return equal to 3k.at n=30A108439
• Numbers n such that if x=sigma(n)-tau(n)-n then n=sigma(x)-tau(x)-x.at n=37A238227
• Expansion of (-1 + Product_{k>=1} (1 + x^k)^k)^2.at n=15A341384