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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 10 |
| 6 | 78 |
| 7 | 755 |
| 8 | 10709 |
| 9 | 259123 |
| 10 | 11703831 |
| 11 | 1006591916 |
| 12 | 164058548700 |
| 13 | 50335887082115 |