T27: Volume of the $d$-dimensional unit ball

This is the table as of 2026-08-13 18:35, by bmatschke.
Run: UnitBallVolume-1786646153

table.yaml holds the numbers and everything said about them. The other
files are what was stored alongside them -- usually the code that
produced them. They are recorded, not run.

The table as it stands now: https://numberdb.org/T27
