520024

Appears in sequences

• Fifth right hand column of triangle A165674.at n=15A165677
• a(n) = [x^n] Product_{k=0..n} (1 + (n^2+k)*x).at n=4A380707
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where A(n,k) = [x^n] Product_{j=0..n} (1 + (k*n+j)*x).at n=40A382347
• a(n) = (4*n)!/(3*n)! * Sum_{k=1..n} 1/(3*n+k).at n=4A384137