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 | -1 |
| 2 | -32 |
| 3 | -211 |
| 4 | -285 |
| 5 | 5179 |
| 6 | 44784 |
| 7 | 162062 |
| 8 | -125122 |
| 9 | -5187417 |
| 10 | -32587255 |
| 11 | -95706881 |
| 12 | 122837972 |
| 13 | 3039216222 |
| 14 | 17745876032 |
| 15 | 52825817007 |
| 16 | -24340390929 |
| 17 | -1256623249600 |
| 18 | -7805634068163 |
| 19 | -26364952524572 |
| 20 | -20649978457115 |
| 21 | 368666542515083 |
| 22 | 2777231006764690 |