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 | 3 |
| 2 | 8 |
| 3 | 27 |
| 4 | 100 |
| 5 | 393 |
| 6 | 1624 |
| 7 | 7017 |
| 8 | 31558 |
| 9 | 147177 |
| 10 | 709592 |
| 11 | 3527769 |
| 12 | 18045428 |
| 13 | 94797147 |
| 14 | 510594056 |
| 15 | 2815698483 |
| 16 | 15877236898 |
| 17 | 91442860467 |
| 18 | 537363872008 |
| 19 | 3219075448251 |
| 20 | 19641501806932 |
| 21 | 121974079707225 |
| 22 | 770381455577048 |
| 23 | 4945495555291017 |
| 24 | 32249369951426822 |