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 | 0 |
| 3 | 0 |
| 4 | 8 |
| 5 | -5 |
| 6 | 18 |
| 7 | -14 |
| 8 | 80 |
| 9 | -9 |
| 10 | 100 |
| 11 | -44 |
| 12 | 204 |
| 13 | -65 |
| 14 | 294 |
| 15 | 30 |
| 16 | 672 |
| 17 | -119 |
| 18 | 540 |
| 19 | -152 |
| 20 | 1040 |
| 21 | 63 |
| 22 | 1210 |
| 23 | -230 |
| 24 | 1752 |
| 25 | -75 |
| 26 | 2028 |
| 27 | -54 |
| 28 | 2996 |
| 29 | -377 |
| 30 | 2190 |
| 31 | -434 |
| 32 | 5440 |
| 33 | 165 |
| 34 | 4624 |
| 35 | 280 |
| 36 | 5472 |
| 37 | -629 |
| 38 | 6498 |
| 39 | 234 |
| 40 | 8800 |
| 41 | -779 |
| 42 | 6300 |
| 43 | -860 |
| 44 | 12188 |
| 45 | 225 |
| 46 | 11638 |
| 47 | -1034 |
| 48 | 14256 |
| 49 | -245 |
| 50 | 13000 |