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 | -2 |
| 3 | 1 |
| 4 | 8 |
| 5 | -6 |
| 6 | 1 |
| 7 | -48 |
| 8 | 44 |
| 9 | -12 |
| 10 | 1 |
| 11 | 384 |
| 12 | -400 |
| 13 | 140 |
| 14 | -20 |
| 15 | 1 |
| 16 | -3840 |
| 17 | 4384 |
| 18 | -1800 |
| 19 | 340 |
| 20 | -30 |
| 21 | 1 |
| 22 | 46080 |
| 23 | -56448 |
| 24 | 25984 |
| 25 | -5880 |
| 26 | 700 |
| 27 | -42 |
| 28 | 1 |
| 29 | -645120 |
| 30 | 836352 |
| 31 | -420224 |
| 32 | 108304 |
| 33 | -15680 |
| 34 | 1288 |
| 35 | -56 |
| 36 | 1 |
| 37 | 10321920 |
| 38 | -14026752 |
| 39 | 7559936 |
| 40 | -2153088 |
| 41 | 359184 |
| 42 | -36288 |
| 43 | 2184 |
| 44 | -72 |
| 45 | 1 |