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 | 3 |
| 4 | 1 |
| 5 | 115 |
| 6 | 11 |
| 7 | 5887 |
| 8 | 151 |
| 9 | 259723 |
| 10 | 15619 |
| 11 | 381773117 |
| 12 | 655177 |
| 13 | 20646903199 |
| 14 | 27085381 |
| 15 | 467168310097 |
| 16 | 2330931341 |
| 17 | 75920439315929441 |
| 18 | 12157712239 |
| 19 | 5278968781483042969 |
| 20 | 37307713155613 |
| 21 | 9093099984535515162569 |
| 22 | 339781108897078469 |
| 23 | 168702835448329388944396777 |