25390625

Appears in sequences

• Least hypotenuse of n distinct Pythagorean triangles.at n=28A006339
• Expansion of (1-5x+40x^2)/((1-5x)(1+5x)).at n=10A091105
• a(n) = n^9*(n^2 + 1)/2.at n=5A170784
• G.f. satisfies: A(x) = x + 4*x^2 + x*A(A(A(A(A(x))))).at n=6A215118