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 | 2 |
| 3 | 5 |
| 4 | 5 |
| 5 | 13 |
| 6 | 29 |
| 7 | 877 |
| 8 | 23 |
| 9 | 53 |
| 10 | 4639 |
| 11 | 22619 |
| 12 | 2423 |
| 13 | 27644437 |
| 14 | 1800937 |
| 15 | 1101959 |
| 16 | 43486067 |
| 17 | 255755771 |
| 18 | 5006399 |
| 19 | 222527 |
| 20 | 4326209287 |
| 21 | 188633 |
| 22 | 574631 |
| 23 | 13369534669 |
| 24 | 1204457631577 |
| 25 | 171659 |
| 26 | 11759883224809 |
| 27 | 2479031 |
| 28 | 171572636187431 |
| 29 | 3516743833 |