Antialias the figures.
Explain this function.
Put choose and distribute back, as "supporting facilities"
even though they do not support anything.

Any place that defines factorial should define choose and distribute
too.
Thou shalt not attepmt performance adjustments without benchmarks.

Integrating the externals from srfi-45.scm did not do any visible
good, but maybe that's just because the good it did is not visible.
Can't not have the Catalan numbers.
Evens.
Where there's odious there's odd.
Powerful numbers.
How could I have neglected the twin primes?
Trying to add the weird numbers.  Not so effective.
Untouchables are too slow too, at least without more work.