This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 313 |
| 4 | 30232 |
| 5 | 6874776 |
| 6 | 3355094696 |
| 7 | 3302015131304 |
| 8 | 6189229701416448 |
| 9 | 20757720442141804032 |
| 10 | 116803259505967824465408 |
| 11 | 1039413737809909553149398528 |
| 12 | 13914325979093456341597993070592 |
| 13 | 268988472559744572003351007811825664 |