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 | 2 |
| 3 | 1 |
| 4 | -2 |
| 5 | 3 |
| 6 | -1 |
| 7 | 0 |
| 8 | 0 |
| 9 | 4 |
| 10 | 1 |
| 11 | 4 |
| 12 | -12 |
| 13 | 8 |
| 14 | 5 |
| 15 | -1 |
| 16 | -10 |
| 17 | 30 |
| 18 | -40 |
| 19 | 25 |
| 20 | 6 |
| 21 | 1 |
| 22 | 18 |
| 23 | -45 |
| 24 | 60 |
| 25 | -75 |
| 26 | 54 |
| 27 | 7 |
| 28 | -1 |
| 29 | -28 |
| 30 | 42 |
| 31 | 0 |
| 32 | 0 |
| 33 | -84 |
| 34 | 98 |
| 35 | 8 |
| 36 | 1 |
| 37 | 40 |
| 38 | 0 |
| 39 | -224 |
| 40 | 420 |
| 41 | -336 |
| 42 | 0 |
| 43 | 160 |
| 44 | 9 |
| 45 | -1 |
| 46 | -54 |
| 47 | -108 |
| 48 | 672 |
| 49 | -1260 |
| 50 | 1512 |
| 51 | -1176 |
| 52 | 288 |
| 53 | 243 |
| 54 | 10 |