388521domain: NAppears in sequencesa(n) = n^2*(2*n^2 - 1); also Sum_{k=0..n-1} (2k+1)^3.at n=21A002593Triangular arithmetic on half-squares: b(n)*(b(n) - 1)/2 where b(n) = floor(n^2/2).at n=42A227970Triangular numbers that are the product of a square number and a prime number.at n=30A253653a(n) = n^2*(2*n^2 + (-1)^n).at n=21A275496