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 | -3 |
| 2 | 48 |
| 3 | -1000 |
| 4 | 25920 |
| 5 | -806736 |
| 6 | 29360128 |
| 7 | -1224440064 |
| 8 | 57600000000 |
| 9 | -3018173044480 |
| 10 | 174359297654784 |
| 11 | -11011033460963328 |
| 12 | 754709361539940352 |
| 13 | -55801305000000000000 |
| 14 | 4427218577690292387840 |
| 15 | -375183514207494575620096 |
| 16 | 33824309717272203758665728 |
| 17 | -3232463698006063164519284736 |
| 18 | 326417514496000000000000000000 |