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 | 16 |
| 3 | 8464 |
| 4 | 724320 |
| 5 | 37229920 |
| 6 | 1558185200 |
| 7 | 59416090096 |
| 8 | 2167506244544 |
| 9 | 77394535148480 |
| 10 | 2734912695301840 |
| 11 | 96159966699204560 |
| 12 | 3372863224609356576 |
| 13 | 118169571125488257824 |
| 14 | 4137881135327148408240 |
| 15 | 144857367811462402307760 |
| 16 | 5070515828676757812456320 |