I have a mug, on which is written
'If E is X0(11): y^2+y = x^3-x^2-10x-20, then the

is
^2 (1-q^{11n})^2)
', with a few hundred terms expanded. And, indeed, the product agrees with the coefficients of
ellan(ellinit([0,-1,1,-10,-20]),100)
Are there any other elliptic curves whose L-functions are such nice infinite products?