Some examples of palindromic polynomials are:
(x+1)^2 = x^2 + 2x + 1
(x+1)^3 = x^3 + 3x^2 + 3x + 1.
These are examples of the expansion of (x + 1)n, which is palindromic for all n, this can be seen from the binomial expansion.
Another example of a palindromic polynomial [which isn't of the form (x + 1)n] is:
x^2 + 3x + 1
An example of an antipalindromic polynomial is:
x^2 - 1
Note the zero coefficient for the term in x.