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 | 8 |
| 6 | 68 |
| 7 | 709 |
| 8 | 10540 |
| 9 | 258623 |
| 10 | 11704072 |
| 11 | 1006628171 |
| 12 | 164059321534 |
| 13 | 50335903460830 |
| 14 | 29003487412989468 |