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 | -1022 |
| 3 | -18828 |
| 4 | 3130860 |
| 5 | 98465256 |
| 6 | -15971457864 |
| 7 | -720886192272 |
| 8 | 113959299787152 |
| 9 | 6785336530113120 |
| 10 | -1044408433392582624 |
| 11 | -78055311088952305344 |
| 12 | 11686493481289162746048 |
| 13 | 1061109190473073445123712 |
| 14 | -154369376198812703738401920 |
| 15 | -16643365586480040091602833664 |