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 | 6 |
| 2 | 116 |
| 3 | 721 |
| 4 | 14031 |
| 5 | 87236 |
| 6 | 1697746 |
| 7 | 10555551 |
| 8 | 205427261 |
| 9 | 1277221666 |
| 10 | 24856698576 |
| 11 | 154543821581 |
| 12 | 3007660527691 |
| 13 | 18699802411296 |
| 14 | 363926923850606 |
| 15 | 2262676091766811 |
| 16 | 44035157785923321 |
| 17 | 273783807103784126 |
| 18 | 5328254092096721836 |
| 19 | 33127840659557879241 |
| 20 | 644718745143703342151 |
| 21 | 4008468719806503388156 |