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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 18 |
| 6 | 55 |
| 7 | 69 |
| 8 | 87 |
| 9 | 119 |
| 10 | 141 |
| 11 | 189 |
| 12 | 249 |
| 13 | 354 |
| 14 | 1586 |
| 15 | 2135 |
| 16 | 2865 |
| 17 | 2930 |
| 18 | 4214 |
| 19 | 7167 |
| 20 | 67485 |
| 21 | 74402 |
| 22 | 79326 |
| 23 | 231349 |