732421875000domain: NAppears in sequences5th binomial transform of (0,0,1,0,0,0, ...).at n=16A081135a(n) = 5^(n-1)*n*(n+1)/2.at n=15A084902Fixed points of A001175 (Pisano periods).at n=16A235702Hypotenuses for which there exist exactly 15 distinct integer triangles.at n=17A290503