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 | 0 |
| 2 | -1 |
| 3 | -1 |
| 4 | 0 |
| 5 | 1 |
| 6 | 4 |
| 7 | 6 |
| 8 | 0 |
| 9 | -1 |
| 10 | -15 |
| 11 | -38 |
| 12 | -20 |
| 13 | 0 |
| 14 | 1 |
| 15 | 56 |
| 16 | 206 |
| 17 | 184 |
| 18 | 50 |
| 19 | 0 |
| 20 | -1 |
| 21 | -185 |
| 22 | -1072 |
| 23 | -1357 |
| 24 | -630 |
| 25 | -105 |
| 26 | 0 |
| 27 | 1 |
| 28 | 204 |
| 29 | 5146 |
| 30 | 9276 |
| 31 | 6060 |
| 32 | 1736 |
| 33 | 196 |
| 34 | 0 |
| 35 | -1 |
| 36 | 6209 |
| 37 | -17334 |
| 38 | -58470 |
| 39 | -52452 |
| 40 | -21102 |
| 41 | -4116 |
| 42 | -336 |
| 43 | 0 |
| 44 | 1 |
| 45 | -112400 |
| 46 | -67682 |
| 47 | 293984 |