RCU Forums - accurate geometry

For designing airfoils (other uses, too) I find an accurate circle very helpful. In Xfoil, I can make any ellipse any size for any shape once I have an accurate circle.txt. I can use 0,0 for the 'nose'(or left side), 1,0 for other side, and center falls on 0.5,0. Other points of total accuracy are .98,.14 & 0.9,0.3 & .8,.4 & .5,.5 and a dozen others - Xfoil reads to 6 or seven digits, though, and that doesn't get the accuracy I need, unless I REALLY hunt for some and then still I don't get it to read like I need for 260 points or so. I suspect AutoCad might help with more points like .98411,.12505, but they are awful time-consuming to find even though formula is simple.
Does anyone know of similar co-ordinate lists already developed?