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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 23 |
| 6 | 719 |
| 7 | 5039 |
| 8 | 1451521 |
| 9 | 2903041 |
| 10 | 5806081 |
| 11 | 46448639 |
| 12 | 92897281 |
| 13 | 371589121 |
| 14 | 10032906239 |
| 15 | 30098718719 |
| 16 | 270888468479 |
| 17 | 812665405439 |
| 18 | 7313988648961 |
| 19 | 21941965946881 |
| 20 | 89874292518420479 |