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 | 5 |
| 6 | 1 |
| 7 | 61 |
| 8 | 1 |
| 9 | 277 |
| 10 | 1 |
| 11 | 50521 |
| 12 | 691 |
| 13 | 540553 |
| 14 | 2 |
| 15 | 199360981 |
| 16 | 3617 |
| 17 | 3878302429 |
| 18 | 43867 |
| 19 | 2404879675441 |
| 20 | 174611 |
| 21 | 14814847529501 |
| 22 | 155366 |
| 23 | 69348874393137901 |
| 24 | 236364091 |
| 25 | 238685140977801337 |
| 26 | 1315862 |
| 27 | 4087072509293123892361 |
| 28 | 6785560294 |
| 29 | 13181680435827682794403 |
| 30 | 6892673020804 |