Write x*cot(x) = Product_{n>=1} (1 + g_n*x^(2*n)); a(n) = denominator(g_n).
A170921
Write x*cot(x) = Product_{n>=1} (1 + g_n*x^(2*n)); a(n) = denominator(g_n).
Terms
- a(0) =3a(1) =45a(2) =105a(3) =4725a(4) =66825a(5) =127702575a(6) =383107725a(7) =18091198125
External references
- oeis: A170921