## Note:

26 is a well-known score to darters, because if you are throwing
at the 20, it's easy to miss by a little bit on either side, and end
up with a 20, and 1, and a 5, for 26 points.

Of course, there are other ways to score 26 points. Once I
wondered just how many different ways there were. The ensuing
calculation yielded this factoid, supposing that the order of the
three thrown darts does not matter (e.g., {0,6,20} is the same as
{20,6,0}), but that, e.g., a double-10 is different from a single-20,
even though they score the same.