The values are
color(white)(aaaa)x/2color(white)(aaaa)xcolor(white)(aaaaaa)ycolor(white)(aaaa)(1821-16x^2)
color(white)(aaaa)0color(white)(aaaaa)0color(white)(aaaaa)1821color(white)(aaaaaa)1821
color(white)(aaaa)1color(white)(aaaaa)2color(white)(aaaaa)1757color(white)(aaaaaa)1757
color(white)(aaaa)2color(white)(aaaaa)4color(white)(aaaaa)1565color(white)(aaaaaa)1565
color(white)(aaaa)3color(white)(aaaaa)6color(white)(aaaaa)1245color(white)(aaaaaa)1245
color(white)(aaaa)4color(white)(aaaaa)8color(white)(aaaaa)797color(white)(aaaaaaaa)797
color(white)(aaaa)5color(white)(aaaaa)10color(white)(aaaaa)221color(white)(aaaaaaa)221
The function is
y=1821-16x^2