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 | 27 |
| 5 | 4860 |
| 6 | 164423 |
| 7 | 2651890 |
| 8 | 25981150 |
| 9 | 180378380 |
| 10 | 971905679 |
| 11 | 4316504623 |
| 12 | 16457726539 |
| 13 | 55463445891 |
| 14 | 168782705327 |
| 15 | 471407278652 |
| 16 | 1223710587908 |
| 17 | 2982045310010 |