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 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 9 |
| 5 | 29 |
| 6 | 173 |
| 7 | 397 |
| 8 | 1629 |
| 9 | 7105 |
| 10 | 47317 |
| 11 | 136649 |
| 12 | 612009 |
| 13 | 3239657 |
| 14 | 16725833 |
| 15 | 144512653 |
| 16 | 442002033 |
| 17 | 2348928709 |
| 18 | 13503344821 |
| 19 | 87284090069 |
| 20 | 570544117893 |
| 21 | 6090993985577 |
| 22 | 19814091021725 |
| 23 | 112414559500753 |
| 24 | 771831588041361 |
| 25 | 5354065003116817 |
| 26 | 43960328737547473 |