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 | -64 |
| 1 | 640 |
| 2 | -3456 |
| 3 | 13440 |
| 4 | -42240 |
| 5 | 114048 |
| 6 | -274560 |
| 7 | 604032 |
| 8 | -1235520 |
| 9 | 2379520 |
| 10 | -4356352 |
| 11 | 7637760 |
| 12 | -12899328 |
| 13 | 21085440 |
| 14 | -33488640 |
| 15 | 51845376 |
| 16 | -78450240 |
| 17 | 116290944 |
| 18 | -169206400 |
| 19 | 242070400 |
| 20 | -341003520 |
| 21 | 473616000 |
| 22 | -649284480 |
| 23 | 879465600 |
| 24 | -1178049600 |