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 | 1 |
| 1 | -1 |
| 2 | 1 |
| 3 | 2 |
| 4 | -3 |
| 5 | 1 |
| 6 | -8 |
| 7 | 12 |
| 8 | -5 |
| 9 | 1 |
| 10 | 40 |
| 11 | -60 |
| 12 | 26 |
| 13 | -7 |
| 14 | 1 |
| 15 | -224 |
| 16 | 336 |
| 17 | -148 |
| 18 | 44 |
| 19 | -9 |
| 20 | 1 |
| 21 | 1344 |
| 22 | -2016 |
| 23 | 896 |
| 24 | -280 |
| 25 | 66 |
| 26 | -11 |
| 27 | 1 |
| 28 | -8448 |
| 29 | 12672 |
| 30 | -5664 |
| 31 | 1824 |
| 32 | -464 |
| 33 | 92 |
| 34 | -13 |
| 35 | 1 |
| 36 | 54912 |
| 37 | -82368 |
| 38 | 36960 |
| 39 | -12144 |
| 40 | 3240 |
| 41 | -708 |
| 42 | 122 |
| 43 | -15 |
| 44 | 1 |
| 45 | -366080 |
| 46 | 549120 |
| 47 | -247104 |
| 48 | 82368 |
| 49 | -22704 |
| 50 | 5280 |
| 51 | -1020 |
| 52 | 156 |
| 53 | -17 |
| 54 | 1 |