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 | 2 |
| 6 | 10 |
| 7 | 12 |
| 8 | 10 |
| 9 | 21 |
| 10 | 25 |
| 11 | 70 |
| 12 | 670 |
| 13 | 239 |
| 14 | 2115 |
| 15 | 586 |
| 16 | 1619 |
| 17 | 26800 |
| 18 | 2505 |
| 19 | 99019 |
| 20 | 40903 |
| 21 | 285641 |
| 22 | 67166 |
| 23 | 1852765 |