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 | -210 |
| 2 | -37800 |
| 3 | -10300080 |
| 4 | -3534651750 |
| 5 | -1351633962672 |
| 6 | -551776752641520 |
| 7 | -235367241169341120 |
| 8 | -103623939263346377400 |
| 9 | -46723958347194591810690 |
| 10 | -21464711387762586693907248 |
| 11 | -10009787904868201520473221840 |