In this editor you can enter or edit tables in YAML format, and you can get a preview of how numberdb would render it.
You cannot save changes here.
Once everything looks good, upload it to the git repository numberdb-data.
$\delta$ and $\alpha$ are the first and second Feigenbaum constants [6][3]. $b$, $c$, $d$, $\kappa$ are additional Feigenbaum constants considered by Broadhurst [2].