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 | 0 |
| 1 | 1 |
| 2 | 12 |
| 3 | 121 |
| 4 | 1200 |
| 5 | 11881 |
| 6 | 117612 |
| 7 | 1164241 |
| 8 | 11524800 |
| 9 | 114083761 |
| 10 | 1129312812 |
| 11 | 11179044361 |
| 12 | 110661130800 |
| 13 | 1095432263641 |
| 14 | 10843661505612 |
| 15 | 107341182792481 |
| 16 | 1062568166419200 |
| 17 | 10518340481399521 |
| 18 | 104120836647576012 |