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 | 7 |
| 4 | 26 |
| 5 | 71 |
| 6 | 258 |
| 7 | 857 |
| 8 | 3148 |
| 9 | 11300 |
| 10 | 41841 |
| 11 | 154140 |
| 12 | 573201 |
| 13 | 2129726 |
| 14 | 7935779 |
| 15 | 29569762 |
| 16 | 110281431 |
| 17 | 411333271 |
| 18 | 1534676318 |
| 19 | 5726191937 |
| 20 | 21367848168 |
| 21 | 79738762725 |
| 22 | 297573920356 |
| 23 | 1110521036955 |
| 24 | 4144432037026 |
| 25 | 15467004104026 |
| 26 | 57723125759179 |
| 27 | 215424338586742 |
| 28 | 803971544759711 |
| 29 | 3000455162798396 |
| 30 | 11197833423648453 |
| 31 | 41790839930063492 |
| 32 | 155965434740272813 |
| 33 | 582070675232252525 |