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 | 10 |
| 2 | -238 |
| 3 | -9140 |
| 4 | 149932 |
| 5 | 13856600 |
| 6 | -114819080 |
| 7 | -29249375600 |
| 8 | -20831812720 |
| 9 | 78881993495200 |
| 10 | 852190309246240 |
| 11 | -258099234921313600 |
| 12 | -5749435918990656320 |
| 13 | 989356137650941398400 |
| 14 | 35156582804554357854080 |
| 15 | -4330067415318711118688000 |
| 16 | -221544548972277705507065600 |