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 | 17 |
| 9 | 277 |
| 10 | 31 |
| 11 | 50521 |
| 12 | 691 |
| 13 | 540553 |
| 14 | 5461 |
| 15 | 199360981 |
| 16 | 929569 |
| 17 | 3878302429 |
| 18 | 3202291 |
| 19 | 2404879675441 |
| 20 | 221930581 |
| 21 | 14814847529501 |
| 22 | 4722116521 |
| 23 | 69348874393137901 |
| 24 | 56963745931 |
| 25 | 238685140977801337 |
| 26 | 14717667114151 |