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 | 24 |
| 3 | 900 |
| 4 | 40352 |
| 5 | 1994322 |
| 6 | 104816880 |
| 7 | 5747466920 |
| 8 | 325077729600 |
| 9 | 18826860841119 |
| 10 | 1110900168420264 |
| 11 | 66547088543789532 |
| 12 | 4036419643768799328 |
| 13 | 247405021070280491110 |
| 14 | 15299980644645295780560 |
| 15 | 953473460271200881693560 |
| 16 | 59817824263728235912396224 |