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) |
|---|---|
| 2 | 0 |
| 3 | 60 |
| 4 | 1212 |
| 5 | 326156 |
| 6 | 11838000 |
| 7 | 132595090 |
| 8 | 833892048 |
| 9 | 3734547512 |
| 10 | 13353954384 |
| 11 | 40631696580 |
| 12 | 109398542704 |
| 13 | 267495297138 |