Write cos(x) = Product_{n>=1} (1 + g_n*x^(2*n)); a(n) = denominator(g_n).
A170913
Write cos(x) = Product_{n>=1} (1 + g_n*x^(2*n)); a(n) = denominator(g_n).
Terms
- a(0) =2a(1) =24a(2) =360a(3) =13440a(4) =453600a(5) =47900160a(6) =5448643200
External references
- oeis: A170913