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 | -2 |
| 2 | 1 |
| 3 | 6 |
| 4 | -5 |
| 5 | 1 |
| 6 | -24 |
| 7 | 24 |
| 8 | -8 |
| 9 | 1 |
| 10 | 114 |
| 11 | -123 |
| 12 | 51 |
| 13 | -11 |
| 14 | 1 |
| 15 | -600 |
| 16 | 672 |
| 17 | -312 |
| 18 | 87 |
| 19 | -14 |
| 20 | 1 |
| 21 | 3372 |
| 22 | -3858 |
| 23 | 1914 |
| 24 | -618 |
| 25 | 132 |
| 26 | -17 |
| 27 | 1 |
| 28 | -19824 |
| 29 | 22992 |
| 30 | -11904 |
| 31 | 4218 |
| 32 | -1068 |
| 33 | 186 |
| 34 | -20 |
| 35 | 1 |
| 36 | 120426 |
| 37 | -140991 |
| 38 | 75183 |
| 39 | -28383 |
| 40 | 8043 |
| 41 | -1689 |
| 42 | 249 |
| 43 | -23 |
| 44 | 1 |
| 45 | -749976 |
| 46 | 884112 |
| 47 | -481704 |
| 48 | 190347 |
| 49 | -58398 |
| 50 | 13929 |
| 51 | -2508 |
| 52 | 321 |
| 53 | -26 |
| 54 | 1 |