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 | -1 |
| 4 | 1 |
| 5 | -2 |
| 6 | 2 |
| 7 | 1 |
| 8 | -3 |
| 9 | 6 |
| 10 | -3 |
| 11 | 1 |
| 12 | -4 |
| 13 | 12 |
| 14 | -12 |
| 15 | 3 |
| 16 | 1 |
| 17 | -5 |
| 18 | 20 |
| 19 | -30 |
| 20 | 15 |
| 21 | 0 |
| 22 | 1 |
| 23 | -6 |
| 24 | 30 |
| 25 | -60 |
| 26 | 45 |
| 27 | 0 |
| 28 | -10 |
| 29 | 1 |
| 30 | -7 |
| 31 | 42 |
| 32 | -105 |
| 33 | 105 |
| 34 | 0 |
| 35 | -70 |
| 36 | 35 |
| 37 | 1 |
| 38 | -8 |
| 39 | 56 |
| 40 | -168 |
| 41 | 210 |
| 42 | 0 |
| 43 | -280 |
| 44 | 280 |
| 45 | -90 |