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 | 5 |
| 5 | 10 |
| 6 | 24 |
| 7 | 49 |
| 8 | 112 |
| 9 | 241 |
| 10 | 548 |
| 11 | 1218 |
| 12 | 2839 |
| 13 | 6547 |
| 14 | 15572 |
| 15 | 37179 |
| 16 | 90555 |
| 17 | 222065 |
| 18 | 552576 |
| 19 | 1384820 |
| 20 | 3506475 |
| 21 | 8936121 |
| 22 | 22941280 |