123481

Appears in sequences

• a(n) = (2*n - 1)*(8*n^2 - 8*n + 3)/3.at n=28A063496
• Number of positive solutions to (x_1)^2 + (x_2)^2 + (x_3)^2 + (x_4)^2 <= n^2.at n=24A341423