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 | 2 |
| 2 | 10 |
| 3 | 60 |
| 4 | 388 |
| 5 | 2606 |
| 6 | 17890 |
| 7 | 124512 |
| 8 | 874562 |
| 9 | 6182198 |
| 10 | 43903044 |
| 11 | 312843918 |
| 12 | 2235028210 |
| 13 | 15999423988 |
| 14 | 114710881886 |
| 15 | 823463493632 |
| 16 | 5917220509358 |