3920400
domain: N
Appears in sequences
- a(n) = n^2*(n+1)*(4*n^3 - 2*n^2 + n + 3)/12.at n=15A101380
- Lah numbers: a(n) = n!*binomial(n-1,7)/8!.at n=4A111598
- a(n) = phi(Lucas(n)).at n=33A197218
- Areas of primitive Heronian triangles K which are perfect squares.at n=40A248108
- Numbers where records occur for the product of exponential divisors function (A157488).at n=37A332622
- Table read by rows. T(n, k) = n*((k + n)!)^2/((k + n)*(n!)^2*k!) for n > 0 and T(0, 0) = 1.at n=40A355005
- Primitives exponential abundant numbers that are not primitives exponential unitary abundant.at n=30A391086