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 | 0 |
| 6 | 535 |
| 7 | 51640 |
| 8 | 2771685 |
| 9 | 114713760 |
| 10 | 4127125695 |
| 11 | 136631722920 |
| 12 | 4292250804985 |
| 13 | 130278290187760 |
| 14 | 3863262740532195 |
| 15 | 112733098867629240 |
| 16 | 3252644718804860925 |
| 17 | 93093809127731630400 |
| 18 | 2649006256251644780935 |