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 | 1 |
| 5 | 9 |
| 6 | 10 |
| 7 | -9 |
| 8 | -38 |
| 9 | -30 |
| 10 | 55 |
| 11 | 153 |
| 12 | 73 |
| 13 | -288 |
| 14 | -587 |
| 15 | -84 |
| 16 | 1378 |
| 17 | 2133 |
| 18 | -539 |
| 19 | -6183 |
| 20 | -7238 |
| 21 | 5667 |
| 22 | 26326 |
| 23 | 22230 |
| 24 | -36089 |
| 25 | -106875 |
| 26 | -56927 |
| 27 | 192912 |
| 28 | 413641 |
| 29 | 84744 |
| 30 | -935450 |
| 31 | -1518579 |
| 32 | 267577 |
| 33 | 4240185 |
| 34 | 5223610 |
| 35 | -3524337 |
| 36 | -18211742 |
| 37 | -16386678 |
| 38 | 23561143 |
| 39 | 74546241 |
| 40 | 43810633 |
| 41 | -128842992 |