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) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 36 |
| 4 | 271 |
| 5 | 2181 |
| 6 | 18583 |
| 7 | 164255 |
| 8 | 1493142 |
| 9 | 13868334 |
| 10 | 131040555 |
| 11 | 1255641305 |
| 12 | 12172468671 |
| 13 | 119167633383 |
| 14 | 1176491130191 |
| 15 | 11699794149335 |
| 16 | 117092364762013 |
| 17 | 1178452895921961 |
| 18 | 11919463485729722 |
| 19 | 121096865173987004 |