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 | 3 |
| 3 | 4 |
| 4 | 12 |
| 5 | 21 |
| 6 | 39 |
| 7 | 91 |
| 8 | 156 |
| 9 | 381 |
| 10 | 1668 |
| 11 | 3292 |
| 12 | 4541 |
| 13 | 6515 |
| 14 | 12927 |
| 15 | 49492 |
| 16 | 72412 |
| 17 | 100595 |
| 18 | 158708 |