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 | -3 |
| 1 | 65 |
| 2 | -1190 |
| 3 | 22050 |
| 4 | -433125 |
| 5 | 9144135 |
| 6 | -208107900 |
| 7 | 5099994900 |
| 8 | -134219460375 |
| 9 | 3781060408125 |
| 10 | -113633468798850 |
| 11 | 3631422078033750 |
| 12 | -123022987568105625 |
| 13 | 4405418319999571875 |
| 14 | -166312279434175875000 |
| 15 | 6602853358582065585000 |
| 16 | -275059081486584416896875 |