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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 16 |
| 5 | 66 |
| 6 | 346 |
| 7 | 2229 |
| 8 | 17000 |
| 9 | 148898 |
| 10 | 1465364 |
| 11 | 15957314 |
| 12 | 190158712 |
| 13 | 2459041744 |
| 14 | 34278016954 |
| 15 | 512253587397 |
| 16 | 8168812190472 |
| 17 | 138450960309882 |