64820

Appears in sequences

• a(n) = n*(2*n^2 + n + 1)/2.at n=39A085786
• Number of permutations avoiding the patterns {2413,2431,4213,3412,3421,4231,4321,4312}; number of strong sorting class based on 2413.at n=13A111281
• Number of n-node triangulations of the double torus S_2 in which every node has degree >= 6.at n=3A129037
• Multiples of 1852.at n=35A303272
• a(n) = n*(2*n - 3 - (-1)^n)*(11*n + (-1)^n)/24.at n=41A308026