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 | 0 |
| 2 | -8 |
| 3 | -56 |
| 4 | 64 |
| 5 | 12672 |
| 6 | 309376 |
| 7 | 2917888 |
| 8 | -163782656 |
| 9 | -12716052480 |
| 10 | -495644917760 |
| 11 | -4004259037184 |
| 12 | 1359174582304768 |
| 13 | 153146435763437568 |
| 14 | 9620207941273255936 |
| 15 | 142966118908253962240 |
| 16 | -62984506636368191946752 |