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 | 3 |
| 5 | 6 |
| 6 | 7 |
| 7 | 8 |
| 8 | 15 |
| 9 | 36 |
| 10 | 38 |
| 11 | 51 |
| 12 | 168 |
| 13 | 1000 |
| 14 | 2955 |
| 15 | 8151 |
| 16 | 16456 |
| 17 | 17902 |
| 18 | 18784 |
| 19 | 24948 |
| 20 | 28731 |
| 21 | 87144 |