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 | 3 |
| 4 | -2 |
| 5 | 1 |
| 6 | -10 |
| 7 | 9 |
| 8 | -3 |
| 9 | 1 |
| 10 | 45 |
| 11 | -40 |
| 12 | 18 |
| 13 | -4 |
| 14 | 1 |
| 15 | -256 |
| 16 | 225 |
| 17 | -100 |
| 18 | 30 |
| 19 | -5 |
| 20 | 1 |
| 21 | 1743 |
| 22 | -1536 |
| 23 | 675 |
| 24 | -200 |
| 25 | 45 |
| 26 | -6 |
| 27 | 1 |
| 28 | -13840 |
| 29 | 12201 |
| 30 | -5376 |
| 31 | 1575 |
| 32 | -350 |
| 33 | 63 |
| 34 | -7 |
| 35 | 1 |
| 36 | 125625 |
| 37 | -110720 |
| 38 | 48804 |
| 39 | -14336 |
| 40 | 3150 |
| 41 | -560 |
| 42 | 84 |
| 43 | -8 |
| 44 | 1 |
| 45 | -1282816 |
| 46 | 1130625 |
| 47 | -498240 |
| 48 | 146412 |
| 49 | -32256 |
| 50 | 5670 |
| 51 | -840 |
| 52 | 108 |
| 53 | -9 |
| 54 | 1 |