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 | 1 |
| 2 | -9 |
| 3 | 181 |
| 4 | -4529 |
| 5 | 126861 |
| 6 | -3806649 |
| 7 | 119653941 |
| 8 | -3889122369 |
| 9 | 129646443421 |
| 10 | -4408213959689 |
| 11 | 152290162367301 |
| 12 | -5330337257966609 |
| 13 | 188617242067457581 |
| 14 | -6736489341630231129 |
| 15 | 242518500968942706261 |
| 16 | -8791448318093732481249 |