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 | 3 |
| 3 | 15 |
| 4 | 30 |
| 5 | 45 |
| 6 | 131 |
| 7 | 181 |
| 8 | 298 |
| 9 | 430 |
| 10 | 1022 |
| 11 | 1429 |
| 12 | 2164 |
| 13 | 2135 |
| 14 | 4620 |
| 15 | 3680 |
| 16 | 9110 |
| 17 | 11981 |
| 18 | 9540 |
| 19 | 87199 |
| 20 | 22330 |
| 21 | 77938 |
| 22 | 182912 |
| 23 | 34081 |