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 | 1 |
| 3 | 1 |
| 4 | -2 |
| 5 | 2 |
| 6 | -1 |
| 7 | 3 |
| 8 | -6 |
| 9 | 6 |
| 10 | 1 |
| 11 | -4 |
| 12 | 12 |
| 13 | -24 |
| 14 | 6 |
| 15 | -1 |
| 16 | 5 |
| 17 | -20 |
| 18 | 60 |
| 19 | -30 |
| 20 | 30 |
| 21 | 1 |
| 22 | -6 |
| 23 | 30 |
| 24 | -120 |
| 25 | 90 |
| 26 | -180 |
| 27 | 20 |
| 28 | -1 |
| 29 | 7 |
| 30 | -42 |
| 31 | 210 |
| 32 | -210 |
| 33 | 630 |
| 34 | -140 |
| 35 | 140 |
| 36 | 1 |
| 37 | -8 |
| 38 | 56 |
| 39 | -336 |
| 40 | 420 |
| 41 | -1680 |
| 42 | 560 |
| 43 | -1120 |
| 44 | 70 |