problems = {n^3 + 1, (n + 1)/(n - 1), Binomial[2 n, n],
Fibonacci[n], (n/2)! Exp[n], (n/2) + Exp[n], (n/5)!, (
Pochhammer[Subscript[a, 1], n] Pochhammer[Subscript[a, 2],
2 n + 1])/Pochhammer[Subscript[b, 1], n],
ChebyshevT[2 n, 1] Pochhammer[Subscript[a, 1], n]};