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 | 0 |
| 2 | -2 |
| 3 | -3 |
| 4 | 0 |
| 5 | 7 |
| 6 | 11 |
| 7 | 1 |
| 8 | -24 |
| 9 | -40 |
| 10 | -7 |
| 11 | 82 |
| 12 | 145 |
| 13 | 37 |
| 14 | -279 |
| 15 | -524 |
| 16 | -174 |
| 17 | 945 |
| 18 | 1888 |
| 19 | 767 |
| 20 | -3185 |
| 21 | -6783 |
| 22 | -3244 |
| 23 | 10676 |
| 24 | 24301 |
| 25 | 13330 |
| 26 | -35567 |
| 27 | -86823 |
| 28 | -53615 |
| 29 | 117672 |
| 30 | 309366 |
| 31 | 212101 |
| 32 | -386224 |
| 33 | -1099385 |
| 34 | -827997 |
| 35 | 1255937 |
| 36 | 3896480 |
| 37 | 3197152 |
| 38 | -4039199 |
| 39 | -13773374 |