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 | 9 |
| 2 | -99 |
| 3 | -7038 |
| 4 | -113643 |
| 5 | 1547469 |
| 6 | 112734378 |
| 7 | 1884830229 |
| 8 | -26299018683 |
| 9 | -1956243650733 |
| 10 | -33464928293199 |
| 11 | 452674080810576 |
| 12 | 34841458485708282 |
| 13 | 611295716269145124 |
| 14 | -7738654169519261871 |
| 15 | -626134798894169029653 |
| 16 | -11321201939484706804827 |
| 17 | 129953731916611548222291 |