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 | -65 |
| 3 | 227 |
| 4 | 25285 |
| 5 | -151321 |
| 6 | -24851645 |
| 7 | 208985867 |
| 8 | 45675130345 |
| 9 | -494053998001 |
| 10 | -134944451180825 |
| 11 | 1784108230326707 |
| 12 | 584753480627757805 |
| 13 | -9136756258815374281 |
| 14 | -3493729771694615374805 |
| 15 | 62987838852907115030747 |
| 16 | 27526170759461264661539665 |