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 | -2 |
| 3 | 15 |
| 4 | 414 |
| 5 | 8263 |
| 6 | 170550 |
| 7 | 3838199 |
| 8 | 95009206 |
| 9 | 2581793607 |
| 10 | 76644369006 |
| 11 | 2472064375039 |
| 12 | 86167184631630 |
| 13 | 3229828797076775 |
| 14 | 129604998329498374 |
| 15 | 5545091849435542023 |
| 16 | 252031805153121499398 |
| 17 | 12129204697482149958439 |