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 | -6 |
| 5 | 1 |
| 6 | 1 |
| 7 | -20 |
| 8 | 12 |
| 9 | -1 |
| 10 | 1 |
| 11 | -70 |
| 12 | 75 |
| 13 | -22 |
| 14 | 1 |
| 15 | 1 |
| 16 | -264 |
| 17 | 406 |
| 18 | -200 |
| 19 | 33 |
| 20 | -1 |
| 21 | 1 |
| 22 | -1034 |
| 23 | 2085 |
| 24 | -1470 |
| 25 | 430 |
| 26 | -48 |
| 27 | 1 |
| 28 | 1 |
| 29 | -4108 |
| 30 | 10296 |
| 31 | -9600 |
| 32 | 4116 |
| 33 | -816 |
| 34 | 64 |
| 35 | -1 |
| 36 | 1 |
| 37 | -16398 |
| 38 | 49231 |
| 39 | -57574 |
| 40 | 33135 |
| 41 | -9786 |
| 42 | 1410 |
| 43 | -84 |
| 44 | 1 |
| 45 | 1 |
| 46 | -65552 |
| 47 | 229482 |