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 | 2 |
| 4 | 1 |
| 5 | 6 |
| 6 | 24 |
| 7 | 1 |
| 8 | 12 |
| 9 | 181 |
| 10 | 1051 |
| 11 | 1 |
| 12 | 30 |
| 13 | 941 |
| 14 | 21992 |
| 15 | 238048 |
| 16 | 1 |
| 17 | 65 |
| 18 | 4662 |
| 19 | 228013 |
| 20 | 9735647 |
| 21 | 195284973 |
| 22 | 1 |
| 23 | 158 |
| 24 | 23691 |
| 25 | 2337694 |
| 26 | 195616247 |
| 27 | 15256715219 |
| 28 | 577169894573 |