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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 5 |
| 5 | -5815 |
| 6 | -956375 |
| 7 | -172917875 |
| 8 | -38579649875 |
| 9 | -10713341611375 |
| 10 | -3663118565923375 |
| 11 | -1519935859717136875 |
| 12 | -754429769289426936875 |
| 13 | -442113820341129750734375 |
| 14 | -302333022017412857174234375 |
| 15 | -238762676857713027642764171875 |
| 16 | -215766282905942334008224968671875 |