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 | 9 |
| 4 | 27 |
| 5 | 133 |
| 6 | 315 |
| 7 | 747 |
| 8 | 2799 |
| 9 | 14175 |
| 10 | 287061 |
| 11 | 530079 |
| 12 | 3061987 |
| 13 | 18371925 |
| 14 | 73487701 |
| 15 | 195967203 |
| 16 | 1175803221 |