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 | 3 |
| 4 | 6 |
| 5 | 11 |
| 6 | 23 |
| 7 | 48 |
| 8 | 107 |
| 9 | 244 |
| 10 | 578 |
| 11 | 1402 |
| 12 | 3485 |
| 13 | 8826 |
| 14 | 22729 |
| 15 | 59340 |
| 16 | 156766 |
| 17 | 418319 |
| 18 | 1125956 |
| 19 | 3053400 |
| 20 | 8334578 |
| 21 | 22881070 |
| 22 | 63135802 |
| 23 | 175000959 |
| 24 | 487042069 |
| 25 | 1360440914 |
| 26 | 3812681435 |
| 27 | 10717405374 |
| 28 | 30209571942 |
| 29 | 85368323429 |
| 30 | 241801775480 |
| 31 | 686366436772 |