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 | -1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 8 |
| 6 | 0 |
| 7 | 24 |
| 8 | -1 |
| 9 | 0 |
| 10 | -8 |
| 11 | 80 |
| 12 | 0 |
| 13 | 120 |
| 14 | -24 |
| 15 | 0 |
| 16 | 1 |
| 17 | 224 |
| 18 | 0 |
| 19 | 288 |
| 20 | 8 |
| 21 | 0 |
| 22 | -80 |
| 23 | 440 |
| 24 | 0 |
| 25 | 64 |
| 26 | -120 |
| 27 | 0 |
| 28 | 24 |
| 29 | 728 |
| 30 | 0 |
| 31 | 840 |
| 32 | -1 |
| 33 | 0 |
| 34 | -224 |
| 35 | 192 |
| 36 | 0 |
| 37 | 1224 |
| 38 | -288 |
| 39 | 0 |
| 40 | -8 |
| 41 | 1520 |
| 42 | 0 |
| 43 | 1680 |
| 44 | 80 |
| 45 | 0 |
| 46 | -440 |
| 47 | 2024 |
| 48 | 0 |
| 49 | 576 |
| 50 | -64 |