Maxima Function
zeta (n)
Returns the Riemann zeta function if x is a negative integer, 0, 1,
or a positive even number,
and returns a noun form zeta (n)
for all other arguments,
including rational noninteger, floating point, and complex arguments.
(%i1) map (zeta, [-4, -3, -2, -1, 0, 1, 2, 3, 4, 5]); 2 4 1 1 1 %pi %pi (%o1) [0, ---, 0, - --, - -, inf, ----, zeta(3), ----, zeta(5)] 120 12 2 6 90