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 | 6 |
| 3 | 26 |
| 4 | 121 |
| 5 | 597 |
| 6 | 3040 |
| 7 | 15876 |
| 8 | 84520 |
| 9 | 456584 |
| 10 | 2494906 |
| 11 | 13759902 |
| 12 | 76475067 |
| 13 | 427805198 |
| 14 | 2406492158 |
| 15 | 13602178244 |
| 16 | 77206507977 |