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 | 3 |
| 3 | 24 |
| 4 | 399 |
| 5 | 12768 |
| 6 | 817215 |
| 7 | 104603520 |
| 8 | 26778501375 |
| 9 | 13710592704000 |
| 10 | 14039646928897023 |
| 11 | 28753196910381103104 |
| 12 | 117773094544920998318079 |
| 13 | 964797190511992818221703168 |
| 14 | 15807237169348490333744384720895 |