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) |
|---|---|
| 1 | 24 |
| 2 | -504 |
| 3 | 4416 |
| 4 | -19320 |
| 5 | 30240 |
| 6 | 100464 |
| 7 | -591360 |
| 8 | 909144 |
| 9 | 1043280 |
| 10 | -5346120 |
| 11 | 4080384 |
| 12 | 6932856 |
| 13 | -5224128 |
| 14 | -17040240 |
| 15 | -14807040 |
| 16 | 110494944 |
| 17 | -46366344 |
| 18 | -191905560 |
| 19 | 135085440 |
| 20 | 84389760 |
| 21 | 269444448 |
| 22 | -410151984 |
| 23 | -489646080 |
| 24 | 611981400 |
| 25 | -346642800 |
| 26 | 1905256080 |