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 | 5 |
| 2 | 1 |
| 3 | 251 |
| 4 | 1 |
| 5 | 6197 |
| 6 | 36140 |
| 7 | 269458 |
| 8 | 391907 |
| 9 | 10067135 |
| 10 | 1 |
| 11 | 1 |
| 12 | 1 |
| 13 | 6170640875 |
| 14 | 1 |
| 15 | 124246559501 |
| 16 | 1 |
| 17 | 5341093125745 |
| 18 | 19418246235419 |
| 19 | 58598336876363 |
| 20 | 196242885967642 |
| 21 | 3359860808719207 |
| 22 | 1 |
| 23 | 36185564197761935 |