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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 15 |
| 6 | 64 |
| 7 | 342 |
| 8 | 2344 |
| 9 | 19137 |
| 10 | 181204 |
| 11 | 1927017 |
| 12 | 22652805 |
| 13 | 290392448 |
| 14 | 4022276630 |
| 15 | 59749492128 |
| 16 | 946174967813 |
| 17 | 15892939156209 |