391500

Appears in sequences

• a(n) = n^2*binomial(n,2).at n=29A092364
• Numbers n such that sigma(n) = 13*phi(n) (where sigma=A000203, phi=A000010).at n=13A171258
• Array read by antidiagonals: T(n,k) = number of n X k lonesum decomposable (0,1) matrices of decomposition order 2.at n=60A299905