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 | -84 |
| 2 | -20412 |
| 3 | -6617856 |
| 4 | -2505409788 |
| 5 | -1027549673640 |
| 6 | -442991672331264 |
| 7 | -197605206331169280 |
| 8 | -90359564898413083644 |
| 9 | -42105781947560460595284 |
| 10 | -19913609001700051596476280 |
| 11 | -9531377528273693889501019392 |