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 | 4 |
| 4 | 18 |
| 5 | 56 |
| 6 | 60 |
| 7 | 88 |
| 8 | 1288 |
| 9 | 1784 |
| 10 | 3406 |
| 11 | 9250 |
| 12 | 11968 |
| 13 | 36216 |
| 14 | 57206 |
| 15 | 89148 |
| 16 | 107514 |
| 17 | 155410 |
| 18 | 202906 |