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 | 3 |
| 3 | 5 |
| 4 | 25 |
| 5 | 519 |
| 6 | 290502305 |
| 7 | 821808425 |
| 8 | 979288025 |
| 9 | 982989263 |
| 10 | 25783323897 |
| 11 | 27771237541 |
| 12 | 31045665345 |
| 13 | 65130752425 |
| 14 | 3708883906025 |
| 15 | 15079242289703 |
| 16 | 973336048301405 |