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 | 3 |
| 2 | 8 |
| 3 | 21 |
| 4 | 56 |
| 5 | 151 |
| 6 | 410 |
| 7 | 1114 |
| 8 | 3027 |
| 9 | 8227 |
| 10 | 22362 |
| 11 | 60785 |
| 12 | 165230 |
| 13 | 449141 |
| 14 | 1220891 |
| 15 | 3318725 |
| 16 | 9021229 |
| 17 | 24522242 |
| 18 | 66658364 |
| 19 | 181196219 |
| 20 | 492542389 |
| 21 | 1338869025 |
| 22 | 3639423341 |
| 23 | 9892978333 |
| 24 | 26891903231 |
| 25 | 73099771885 |
| 26 | 198705781579 |