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 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 73 |
| 5 | 409 |
| 6 | 801 |
| 7 | 1584 |
| 8 | 2241 |
| 9 | 30601 |
| 10 | 30601 |
| 11 | 78409 |
| 12 | 156825 |
| 13 | 862416 |
| 14 | 862416 |
| 15 | 7929009 |
| 16 | 28173825 |
| 17 | 196668004 |
| 18 | 196668004 |