554402domain: NAppears in sequences(1/4) * number of ways to select 3 distinct collinear points from a square of grid points with side length n.at n=38A320540a(n) = coefficient of x^n in A(x) where x = Sum_{n=-oo..+oo} (-1)^(n-1) * x^(n*(n+1)) * A(x)^(n^2).at n=14A359669