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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 14 |
| 7 | 15 |
| 8 | 39 |
| 9 | 201 |
| 10 | 249 |
| 11 | 885 |
| 12 | 1005 |
| 13 | 1254 |
| 14 | 1635 |
| 15 | 3306 |
| 16 | 3522 |
| 17 | 9602 |
| 18 | 19785 |
| 19 | 72698 |
| 20 | 233583 |
| 21 | 328689 |
| 22 | 537918 |
| 23 | 887535 |
| 24 | 980925 |
| 25 | 1154598 |
| 26 | 1499606 |
| 27 | 1936890 |
| 28 | 2016951 |
| 29 | 2143374 |