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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | -4 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | -24 |
| 11 | -48 |
| 12 | 60 |
| 13 | 0 |
| 14 | -300 |
| 15 | -480 |
| 16 | 144 |
| 17 | 1392 |
| 18 | -4392 |
| 19 | -7248 |
| 20 | 2904 |
| 21 | 13280 |
| 22 | -27348 |
| 23 | -142512 |
| 24 | 29948 |
| 25 | 241872 |
| 26 | -336072 |
| 27 | -1711936 |
| 28 | -950268 |
| 29 | 4759680 |
| 30 | -2790212 |
| 31 | -25599600 |
| 32 | -17648472 |
| 33 | 53777216 |
| 34 | 24551472 |
| 35 | -385317888 |