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 | 0 |
| 2 | 651 |
| 3 | 72912 |
| 4 | 1146132 |
| 5 | -564075008 |
| 6 | -57512186172 |
| 7 | 1056905938512 |
| 8 | 734330714764860 |
| 9 | 53237542070899200 |
| 10 | -3985440426544029348 |
| 11 | -1018566068308173405360 |
| 12 | -44117503923016652612508 |
| 13 | 8869675469814066455364096 |
| 14 | 1400650029016035400451535476 |
| 15 | 15983187713796350482010970064 |