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) |
|---|---|
| 1 | 1 |
| 2 | -4 |
| 3 | 1 |
| 4 | 32 |
| 5 | -12 |
| 6 | 1 |
| 7 | -384 |
| 8 | 176 |
| 9 | -24 |
| 10 | 1 |
| 11 | 6144 |
| 12 | -3200 |
| 13 | 560 |
| 14 | -40 |
| 15 | 1 |
| 16 | -122880 |
| 17 | 70144 |
| 18 | -14400 |
| 19 | 1360 |
| 20 | -60 |
| 21 | 1 |
| 22 | 2949120 |
| 23 | -1806336 |
| 24 | 415744 |
| 25 | -47040 |
| 26 | 2800 |
| 27 | -84 |
| 28 | 1 |
| 29 | -82575360 |
| 30 | 53526528 |
| 31 | -13447168 |
| 32 | 1732864 |
| 33 | -125440 |
| 34 | 5152 |
| 35 | -112 |
| 36 | 1 |
| 37 | 2642411520 |
| 38 | -1795424256 |
| 39 | 483835904 |