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 | 0 |
| 1 | 1 |
| 2 | -1 |
| 3 | 2 |
| 4 | -4 |
| 5 | -2 |
| 6 | -6 |
| 7 | 0 |
| 8 | -12 |
| 9 | -8 |
| 10 | -16 |
| 11 | -4 |
| 12 | -28 |
| 13 | -20 |
| 14 | -36 |
| 15 | -12 |
| 16 | -60 |
| 17 | -44 |
| 18 | -76 |
| 19 | -28 |
| 20 | -124 |
| 21 | -92 |
| 22 | -156 |
| 23 | -60 |
| 24 | -252 |
| 25 | -188 |
| 26 | -316 |
| 27 | -124 |
| 28 | -508 |
| 29 | -380 |
| 30 | -636 |
| 31 | -252 |
| 32 | -1020 |
| 33 | -764 |
| 34 | -1276 |
| 35 | -508 |
| 36 | -2044 |
| 37 | -1532 |
| 38 | -2556 |
| 39 | -1020 |
| 40 | -4092 |
| 41 | -3068 |
| 42 | -5116 |
| 43 | -2044 |
| 44 | -8188 |
| 45 | -6140 |
| 46 | -10236 |
| 47 | -4092 |
| 48 | -16380 |
| 49 | -12284 |
| 50 | -20476 |