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 | 24 |
| 1 | 144 |
| 2 | 13896 |
| 3 | 842400 |
| 4 | 36604920 |
| 5 | 2333944368 |
| 6 | 126441557448 |
| 7 | 6680853691200 |
| 8 | 387982670513688 |
| 9 | 20676854461594320 |
| 10 | 1158249535425969384 |
| 11 | 63778918790403180000 |
| 12 | 3507499386329443453752 |
| 13 | 194248225087593045241968 |