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 | 4 |
| 2 | 6 |
| 3 | 16 |
| 4 | 24 |
| 5 | 30 |
| 6 | 54 |
| 7 | 96 |
| 8 | 178 |
| 9 | 274 |
| 10 | 1332 |
| 11 | 2766 |
| 12 | 3060 |
| 13 | 4204 |
| 14 | 17736 |
| 15 | 190062 |
| 16 | 223536 |
| 17 | 260400 |
| 18 | 683080 |