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 | 2 |
| 4 | -4 |
| 5 | 5 |
| 6 | -4 |
| 7 | 6 |
| 8 | -8 |
| 9 | 7 |
| 10 | -10 |
| 11 | 12 |
| 12 | -8 |
| 13 | 12 |
| 14 | -12 |
| 15 | 10 |
| 16 | -16 |
| 17 | 16 |
| 18 | -14 |
| 19 | 20 |
| 20 | -20 |
| 21 | 12 |
| 22 | -24 |
| 23 | 22 |
| 24 | -16 |
| 25 | 25 |
| 26 | -24 |
| 27 | 20 |
| 28 | -24 |
| 29 | 30 |
| 30 | -20 |
| 31 | 32 |
| 32 | -32 |
| 33 | 24 |
| 34 | -32 |
| 35 | 30 |
| 36 | -28 |
| 37 | 36 |
| 38 | -40 |
| 39 | 24 |
| 40 | -40 |
| 41 | 42 |
| 42 | -24 |
| 43 | 42 |
| 44 | -48 |
| 45 | 35 |
| 46 | -44 |
| 47 | 46 |
| 48 | -32 |
| 49 | 43 |
| 50 | -50 |
| 51 | 32 |
| 52 | -48 |
| 53 | 52 |
| 54 | -40 |
| 55 | 60 |
| 56 | -48 |
| 57 | 40 |
| 58 | -60 |
| 59 | 60 |
| 60 | -40 |