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 | 3 |
| 2 | 5 |
| 3 | 29 |
| 4 | 87 |
| 5 | 358 |
| 6 | 1252 |
| 7 | 4749 |
| 8 | 17285 |
| 9 | 64235 |
| 10 | 236211 |
| 11 | 873250 |
| 12 | 3219652 |
| 13 | 11886927 |
| 14 | 43856285 |
| 15 | 161862005 |
| 16 | 597285195 |
| 17 | 2204231074 |
| 18 | 8134165648 |
| 19 | 30017792409 |
| 20 | 110774426621 |
| 21 | 408792375587 |
| 22 | 1508567655759 |
| 23 | 5567079710158 |
| 24 | 20544224979592 |