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) |
|---|---|
| 2 | 6 |
| 3 | 102 |
| 4 | 1212 |
| 5 | 12330 |
| 6 | 114888 |
| 7 | 1011486 |
| 8 | 8558712 |
| 9 | 70324884 |
| 10 | 564931230 |
| 11 | 4457508264 |
| 12 | 34662068784 |
| 13 | 266296074408 |
| 14 | 2025114297696 |
| 15 | 15267023594670 |
| 16 | 114233412701424 |
| 17 | 849144504823848 |
| 18 | 6275680692866946 |
| 19 | 46143888578211414 |
| 20 | 337737723001251660 |
| 21 | 2461833584990710434 |