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 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 691 |
| 7 | 1 |
| 8 | 3617 |
| 9 | 43867 |
| 10 | 617 |
| 11 | 593 |
| 12 | 2294797 |
| 13 | 657931 |
| 14 | 362903 |
| 15 | 1001259881 |
| 16 | 305065927 |
| 17 | 151628697551 |
| 18 | 26315271553053477373 |
| 19 | 154210205991661 |
| 20 | 1897170067619 |
| 21 | 1520097643918070802691 |
| 22 | 1798482437 |
| 23 | 67568238839737 |
| 24 | 153289748932447906241 |
| 25 | 47464429777438199 |