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 | 4 |
| 4 | -8 |
| 5 | 1 |
| 6 | -8 |
| 7 | 36 |
| 8 | -12 |
| 9 | 1 |
| 10 | 16 |
| 11 | -128 |
| 12 | 80 |
| 13 | -16 |
| 14 | 1 |
| 15 | -32 |
| 16 | 400 |
| 17 | -400 |
| 18 | 140 |
| 19 | -20 |
| 20 | 1 |
| 21 | 64 |
| 22 | -1152 |
| 23 | 1680 |
| 24 | -896 |
| 25 | 216 |
| 26 | -24 |
| 27 | 1 |
| 28 | -128 |
| 29 | 3136 |
| 30 | -6272 |
| 31 | 4704 |
| 32 | -1680 |
| 33 | 308 |
| 34 | -28 |
| 35 | 1 |
| 36 | 256 |
| 37 | -8192 |
| 38 | 21504 |
| 39 | -21504 |
| 40 | 10560 |
| 41 | -2816 |