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) |
|---|---|
| 3 | 2 |
| 4 | -10 |
| 5 | 5 |
| 6 | 42 |
| 7 | -42 |
| 8 | 3 |
| 9 | 6 |
| 10 | -168 |
| 11 | 252 |
| 12 | -56 |
| 13 | -56 |
| 14 | 7 |
| 15 | 7 |
| 16 | 660 |
| 17 | -1320 |
| 18 | 540 |
| 19 | 360 |
| 20 | -24 |
| 21 | -144 |
| 22 | -72 |
| 23 | 4 |
| 24 | 8 |
| 25 | 8 |
| 26 | -2574 |
| 27 | 6435 |
| 28 | -3960 |
| 29 | -1980 |
| 30 | 495 |
| 31 | 1485 |
| 32 | 495 |
| 33 | -90 |
| 34 | -90 |
| 35 | -180 |
| 36 | -90 |
| 37 | 9 |
| 38 | 9 |
| 39 | 9 |
| 40 | 10010 |
| 41 | -30030 |
| 42 | 25025 |
| 43 | 10010 |
| 44 | -5720 |
| 45 | -11440 |
| 46 | -2860 |
| 47 | 165 |
| 48 | 1980 |
| 49 | 990 |
| 50 | 1980 |
| 51 | 660 |
| 52 | -110 |
| 53 | -110 |
| 54 | -220 |
| 55 | -220 |
| 56 | -110 |
| 57 | 5 |
| 58 | 10 |
| 59 | 10 |
| 60 | 10 |