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 | 6 |
| 2 | -62 |
| 3 | -1548 |
| 4 | 8940 |
| 5 | 660456 |
| 6 | -417864 |
| 7 | -390855312 |
| 8 | -2058477168 |
| 9 | 294079701600 |
| 10 | 3580055071776 |
| 11 | -266717777137344 |
| 12 | -5459606030198592 |
| 13 | 280902469732324992 |
| 14 | 8640952900866956160 |
| 15 | -333552471067548152064 |
| 16 | -14703515590679714467584 |
| 17 | 434789181089837215630848 |