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 | 372 |
| 2 | 372 |
| 3 | 29250 |
| 4 | 138384 |
| 5 | 29250 |
| 6 | -134120 |
| 7 | 10881000 |
| 8 | 10881000 |
| 9 | -134120 |
| 10 | 54261375 |
| 11 | -49892640 |
| 12 | 855562500 |
| 13 | -49892640 |
| 14 | 54261375 |
| 15 | -6139293372 |
| 16 | 20185231500 |
| 17 | -3923010000 |
| 18 | -3923010000 |
| 19 | 20185231500 |
| 20 | -6139293372 |