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 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | -4 |
| 4 | 6 |
| 5 | 0 |
| 6 | 42 |
| 7 | -24 |
| 8 | 36 |
| 9 | 0 |
| 10 | 7296 |
| 11 | 252 |
| 12 | -144 |
| 13 | 216 |
| 14 | 0 |
| 15 | -7931976 |
| 16 | 43776 |
| 17 | 1512 |
| 18 | -864 |
| 19 | 1296 |
| 20 | 0 |
| 21 | -45557382240 |
| 22 | -47591856 |
| 23 | 262656 |
| 24 | 9072 |
| 25 | -5184 |
| 26 | 7776 |
| 27 | 0 |
| 28 | 3064554175021200 |
| 29 | -273344293440 |
| 30 | -285551136 |
| 31 | 1575936 |
| 32 | 54432 |
| 33 | -31104 |
| 34 | 46656 |
| 35 | 0 |
| 36 | 801993619807364206080 |