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 | 7 |
| 3 | 18 |
| 4 | 80 |
| 5 | 242 |
| 6 | 728 |
| 7 | 2186 |
| 8 | 6560 |
| 9 | 19682 |
| 10 | 59048 |
| 11 | 177146 |
| 12 | 531440 |
| 13 | 1594322 |