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 | 3 |
| 2 | 9 |
| 3 | 27 |
| 4 | 78 |
| 5 | 225 |
| 6 | 633 |
| 7 | 1785 |
| 8 | 4944 |
| 9 | 13742 |
| 10 | 37686 |
| 11 | 103767 |
| 12 | 282425 |
| 13 | 772719 |