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 | 8 |
| 2 | 45 |
| 3 | 239 |
| 4 | 1154 |
| 5 | 5139 |
| 6 | 21374 |
| 7 | 83877 |
| 8 | 312913 |
| 9 | 1115334 |
| 10 | 3813001 |
| 11 | 12556041 |
| 12 | 39993741 |
| 13 | 123663399 |
| 14 | 372232239 |
| 15 | 1093036739 |
| 16 | 3136328324 |
| 17 | 8805588398 |
| 18 | 24218635622 |
| 19 | 65321490327 |
| 20 | 172947226965 |
| 21 | 449923333530 |
| 22 | 1151130040924 |