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) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 1 |
| 6 | 3 |
| 7 | 2 |
| 8 | 5 |
| 9 | 4 |
| 10 | 9 |
| 11 | 7 |
| 12 | 23 |
| 13 | 18 |
| 14 | 74 |
| 15 | 106 |
| 16 | 619 |
| 17 | 2076 |
| 18 | 22526 |
| 19 | 112834 |
| 20 | 4799825 |
| 21 | 31138965 |
| 22 | 4207943011 |
| 23 | 115979718015 |
| 24 | 13482672647959 |