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 | 2 |
| 2 | 7 |
| 3 | 43 |
| 4 | 403 |
| 5 | 5188 |
| 6 | 85569 |
| 7 | 1725291 |
| 8 | 41145705 |
| 9 | 1133047596 |
| 10 | 35377360292 |
| 11 | 1234796503280 |
| 12 | 47636225803285 |
| 13 | 2012509471127885 |
| 14 | 92398547122062997 |
| 15 | 4580472438441602301 |
| 16 | 243822925502110419105 |
| 17 | 13870297863425823346284 |