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 | 1 |
| 2 | 6 |
| 3 | 48 |
| 4 | 528 |
| 5 | 8160 |
| 6 | 179520 |
| 7 | 5666304 |
| 8 | 257819136 |
| 9 | 16962407424 |
| 10 | 1617060046848 |
| 11 | 223709857824768 |
| 12 | 44962767953608704 |
| 13 | 13140310268741124096 |
| 14 | 5587767779596757434368 |
| 15 | 3459297434976642415460352 |