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 | 1 |
| 3 | 9 |
| 4 | 1 |
| 5 | 73 |
| 6 | 657 |
| 7 | 1 |
| 8 | 585 |
| 9 | 4745 |
| 10 | 42705 |
| 11 | 384345 |
| 12 | 1 |
| 13 | 4681 |
| 14 | 304265 |
| 15 | 2738385 |
| 16 | 22211345 |
| 17 | 199902105 |
| 18 | 1799118945 |
| 19 | 1 |
| 20 | 37449 |
| 21 | 19477641 |
| 22 | 156087945 |
| 23 | 175298769 |
| 24 | 11394419985 |
| 25 | 92421406545 |
| 26 | 102549779865 |
| 27 | 831792658905 |
| 28 | 7486133930145 |
| 29 | 67375205371305 |
| 30 | 1 |
| 31 | 299593 |