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 | 2 |
| 3 | 1 |
| 4 | 5 |
| 5 | 7 |
| 6 | 3 |
| 7 | 20 |
| 8 | 58 |
| 9 | 60 |
| 10 | 21 |
| 11 | 179 |
| 12 | 838 |
| 13 | 1458 |
| 14 | 1113 |
| 15 | 315 |
| 16 | 4082 |
| 17 | 25171 |
| 18 | 60780 |
| 19 | 72135 |
| 20 | 42210 |
| 21 | 9765 |
| 22 | 218225 |
| 23 | 1610977 |
| 24 | 4871193 |
| 25 | 7745115 |
| 26 | 6844635 |
| 27 | 3193155 |
| 28 | 615195 |