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 | 1 |
| 3 | -1 |
| 4 | 1 |
| 5 | -2 |
| 6 | 1 |
| 7 | 1 |
| 8 | -3 |
| 9 | 12 |
| 10 | -1 |
| 11 | 1 |
| 12 | -4 |
| 13 | 33 |
| 14 | -128 |
| 15 | 1 |
| 16 | 1 |
| 17 | -5 |
| 18 | 64 |
| 19 | -731 |
| 20 | 1872 |
| 21 | -1 |
| 22 | 1 |
| 23 | -6 |
| 24 | 105 |
| 25 | -2160 |
| 26 | 25857 |
| 27 | -37600 |
| 28 | 1 |
| 29 | 1 |
| 30 | -7 |
| 31 | 156 |
| 32 | -4765 |
| 33 | 121600 |
| 34 | -1311379 |
| 35 | 990784 |
| 36 | -1 |
| 37 | 1 |
| 38 | -8 |
| 39 | 217 |
| 40 | -8896 |
| 41 | 368145 |
| 42 | -10138880 |
| 43 | 89060065 |
| 44 | -32333824 |
| 45 | 1 |