129570domain: NAppears in sequences144*n^2 - n.at n=29A156635a(n) = 576*n^2 - 2*n.at n=14A158371a(n) = 900*n^2 - 30.at n=11A158669Number of squares and rectangles in the interior of the square with vertices (n,0), (0,n), (-n,0) and (0,-n) in a square (x,y)-grid.at n=20A330805