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 | 0 |
| 1 | 2 |
| 2 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 13 |
| 6 | 35 |
| 7 | 171 |
| 8 | 1934 |
| 9 | 97151 |
| 10 | 52942129 |
| 11 | 1435382350480 |
| 12 | 21191828466255176653 |