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 | 2 |
| 1 | 3 |
| 2 | 9 |
| 3 | 29 |
| 4 | 107 |
| 5 | 430 |
| 6 | 1840 |
| 7 | 8230 |
| 8 | 38015 |
| 9 | 179873 |
| 10 | 867079 |
| 11 | 4242111 |
| 12 | 21006358 |
| 13 | 105072063 |
| 14 | 530058079 |
| 15 | 2693632580 |
| 16 | 13775807415 |
| 17 | 70847283680 |
| 18 | 366167521240 |
| 19 | 1900884870494 |
| 20 | 9907318315587 |
| 21 | 51822028122623 |
| 22 | 271949090063769 |
| 23 | 1431369293422604 |
| 24 | 7554372307564282 |