69730

Appears in sequences

• a(n) = n*(n+1)*(3*n^2+n-1)/6.at n=19A103220
• Ceiling((4n+1/n)^n).at n=3A197764
• Second elementary symmetric function of the first n terms of (1,1,2,2,3,3,4,4,...).at n=36A203246