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 | 2 |
| 4 | 3 |
| 5 | 7 |
| 6 | 14 |
| 7 | 33 |
| 8 | 84 |
| 9 | 204 |
| 10 | 627 |
| 11 | 1558 |
| 12 | 5692 |
| 13 | 14402 |
| 14 | 60752 |
| 15 | 155828 |
| 16 | 747046 |
| 17 | 1937292 |
| 18 | 10385051 |
| 19 | 27176489 |
| 20 | 161160411 |
| 21 | 424958631 |
| 22 | 2760858706 |
| 23 | 7327447983 |
| 24 | 51762453941 |
| 25 | 138150105263 |
| 26 | 1054164297384 |
| 27 | 2827224795106 |
| 28 | 23174732414244 |
| 29 | 62420125297576 |
| 30 | 546984814641114 |