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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 20 |
| 5 | 1 |
| 6 | 1 |
| 7 | 381 |
| 8 | 381 |
| 9 | 1 |
| 10 | 1 |
| 11 | 7240 |
| 12 | 137922 |
| 13 | 7240 |
| 14 | 1 |
| 15 | 1 |
| 16 | 137561 |
| 17 | 49797082 |
| 18 | 49797082 |
| 19 | 137561 |
| 20 | 1 |
| 21 | 1 |
| 22 | 2613660 |
| 23 | 17976884163 |
| 24 | 341607982520 |
| 25 | 17976884163 |
| 26 | 2613660 |
| 27 | 1 |
| 28 | 1 |
| 29 | 49659541 |
| 30 | 6489657796503 |
| 31 | 2343107128988843 |