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 | 5 |
| 2 | -73 |
| 3 | -1345 |
| 4 | 14737 |
| 5 | 600925 |
| 6 | -4216505 |
| 7 | -374426425 |
| 8 | 1020390305 |
| 9 | 298652268725 |
| 10 | 593277094615 |
| 11 | -289712837877425 |
| 12 | -2088116897382095 |
| 13 | 330261712856941325 |
| 14 | 4311569491549495655 |
| 15 | -431561222581976019625 |
| 16 | -8495813265487638710975 |
| 17 | 634208930681100205217125 |