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) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 84 |
| 3 | 564 |
| 4 | 3804 |
| 5 | 25308 |
| 6 | 167796 |
| 7 | 1108452 |
| 8 | 7305132 |
| 9 | 48043044 |
| 10 | 315466884 |
| 11 | 2068604028 |
| 12 | 13549151244 |
| 13 | 88658702484 |
| 14 | 579649775796 |
| 15 | 3786953782764 |