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) |
|---|---|
| 0 | 1 |
| 1 | 128 |
| 2 | 279936 |
| 3 | 5971968 |
| 4 | 699840000000 |
| 5 | 93312000000 |
| 6 | 115269666624000000 |
| 7 | 35129803161600000 |
| 8 | 160060165655040000000 |
| 9 | 1016255020032000000 |
| 10 | 103970660613603049728000000 |
| 11 | 240047701272387993600000 |
| 12 | 41516393959179372527058885120000000 |