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 | 1 |
| 3 | 9 |
| 4 | 144 |
| 5 | 4140 |
| 6 | 214200 |
| 7 | 20264832 |
| 8 | 3580049088 |
| 9 | 1202974894656 |
| 10 | 779257681804800 |
| 11 | 982078160760512640 |
| 12 | 2423077679970846226944 |
| 13 | 11755368773275419420291072 |
| 14 | 112487517660848696830655493120 |