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 | 2 |
| 2 | 6 |
| 3 | 15 |
| 4 | 39 |
| 5 | 98 |
| 6 | 248 |
| 7 | 621 |
| 8 | 1558 |
| 9 | 3906 |
| 10 | 9792 |
| 11 | 24546 |
| 12 | 61528 |
| 13 | 154230 |
| 14 | 386597 |
| 15 | 969056 |
| 16 | 2429063 |
| 17 | 6088760 |
| 18 | 15262258 |
| 19 | 38256809 |
| 20 | 95895600 |
| 21 | 240374623 |
| 22 | 602529828 |
| 23 | 1510318305 |
| 24 | 3785806567 |
| 25 | 9489609784 |
| 26 | 23786924200 |
| 27 | 59624976768 |
| 28 | 149457652641 |
| 29 | 374634777972 |