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 | -2 |
| 2 | -2 |
| 3 | -36 |
| 4 | 54 |
| 5 | -476 |
| 6 | 556 |
| 7 | -6088 |
| 8 | 35878 |
| 9 | -156844 |
| 10 | 444164 |
| 11 | -1734648 |
| 12 | 11948604 |
| 13 | -35313048 |
| 14 | 156354328 |
| 15 | -864527760 |
| 16 | 4733447686 |
| 17 | -12692853452 |
| 18 | 54065039380 |
| 19 | -226098757912 |
| 20 | 1278838329812 |
| 21 | -5257771138376 |
| 22 | 19455009120232 |
| 23 | -76455773381360 |
| 24 | 453306681446748 |