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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 114 |
| 6 | 628 |
| 7 | 4062 |
| 8 | 30360 |
| 9 | 251658 |
| 10 | 2308648 |
| 11 | 23351268 |
| 12 | 259031232 |
| 13 | 3091784268 |
| 14 | 39697601392 |
| 15 | 546982720164 |
| 16 | 8064677125440 |