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 | 19 |
| 5 | 65664 |
| 6 | 73500514 |
| 7 | 37504171766 |
| 8 | 12562875567065 |
| 9 | 3267743403989063 |
| 10 | 716661691995997667 |
| 11 | 138409456269288832810 |
| 12 | 24126483152959778734211 |
| 13 | 3853212295470158037255129 |