204624

Appears in sequences

• a(n) = n^2*(n^2 - 1)/3.at n=28A112742
• Triangle read by rows: T(n,k) is the number of stretching pairs in all permutations in S_{n,k} (=set of permutations in S_n with k cycles) (n >= 3; 1 <= k <= n-2).at n=23A216118
• Exponential abundant numbers that are not exponential unitary abundant.at n=28A391085
• Exponential Zumkeller numbers that are not exponential unitary Zumkeller numbers.at n=31A391090