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) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 7 |
| 4 | 14 |
| 5 | 40 |
| 6 | 103 |
| 7 | 278 |
| 8 | 783 |
| 9 | 2172 |
| 10 | 6191 |
| 11 | 17701 |
| 12 | 51205 |
| 13 | 149149 |
| 14 | 436932 |
| 15 | 1287378 |
| 16 | 3809498 |
| 17 | 11321211 |
| 18 | 33764868 |
| 19 | 101029398 |
| 20 | 303175579 |
| 21 | 912147300 |
| 22 | 2750855002 |
| 23 | 8313825647 |
| 24 | 25176031558 |
| 25 | 76375623757 |
| 26 | 232082001064 |
| 27 | 706304629714 |
| 28 | 2152571584249 |
| 29 | 6568923555719 |