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 | 24 |
| 3 | 117 |
| 4 | 336 |
| 5 | -237 |
| 6 | -10296 |
| 7 | -76443 |
| 8 | -354144 |
| 9 | -922077 |
| 10 | 1476984 |
| 11 | 34867797 |
| 12 | 242017776 |
| 13 | 1064447283 |
| 14 | 2465133864 |
| 15 | -6890111163 |
| 16 | -116749235904 |
| 17 | -761741108157 |
| 18 | -3175197967656 |
| 19 | -6358056037323 |
| 20 | 28515500892816 |
| 21 | 387075408075603 |
| 22 | 2383715742284424 |
| 23 | 9392840736385317 |
| 24 | 15549832333971936 |