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 | 9 |
| 3 | 39 |
| 4 | 201 |
| 5 | 1184 |
| 6 | 7702 |
| 7 | 53911 |
| 8 | 397557 |
| 9 | 3048955 |
| 10 | 24106415 |
| 11 | 195296943 |
| 12 | 1613846646 |
| 13 | 13556756261 |
| 14 | 115465507935 |
| 15 | 995112599484 |
| 16 | 8663956207026 |
| 17 | 76105984161825 |
| 18 | 673776962356604 |
| 19 | 6006525919368810 |
| 20 | 53878729390812464 |
| 21 | 485986685605473234 |
| 22 | 4405654516157364292 |
| 23 | 40121204955640303216 |
| 24 | 366893555203205479291 |