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 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 34 |
| 5 | 633 |
| 6 | 23368 |
| 7 | 1699012 |
| 8 | 237934760 |
| 9 | 64558137140 |
| 10 | 34126032806936 |
| 11 | 35513501049012952 |