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 | -18 |
| 2 | -1998 |
| 3 | -1156356 |
| 4 | -382624794 |
| 5 | -177898412808 |
| 6 | -76229340502932 |
| 7 | -35444571049682064 |
| 8 | -16446161396159063082 |
| 9 | -7832755937588033655054 |
| 10 | -3761678744155185551186328 |
| 11 | -1828621496185972561746774324 |
| 12 | -895757692814150533920101726460 |