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 | -1 |
| 2 | -3 |
| 3 | -3 |
| 4 | 3 |
| 5 | -16 |
| 6 | -16 |
| 7 | -8 |
| 8 | -8 |
| 9 | 8 |
| 10 | 24 |
| 11 | 24 |
| 12 | -24 |
| 13 | -210 |
| 14 | -210 |
| 15 | -105 |
| 16 | -105 |
| 17 | 105 |
| 18 | -42 |
| 19 | -42 |
| 20 | -21 |
| 21 | -21 |
| 22 | 21 |
| 23 | 63 |
| 24 | 63 |
| 25 | -63 |
| 26 | 336 |
| 27 | 336 |
| 28 | 168 |
| 29 | 168 |
| 30 | -168 |
| 31 | -504 |
| 32 | -504 |
| 33 | 504 |
| 34 | -7150 |
| 35 | -7150 |
| 36 | -3575 |
| 37 | -3575 |
| 38 | 3575 |
| 39 | -1430 |
| 40 | -1430 |
| 41 | -715 |
| 42 | -715 |
| 43 | 715 |
| 44 | 2145 |
| 45 | 2145 |
| 46 | -2145 |
| 47 | -550 |
| 48 | -550 |