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 | -1 |
| 3 | -1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 1 |
| 7 | -3 |
| 8 | -5 |
| 9 | -1 |
| 10 | 11 |
| 11 | 15 |
| 12 | -5 |
| 13 | -44 |
| 14 | -41 |
| 15 | 51 |
| 16 | 169 |
| 17 | 85 |
| 18 | -303 |
| 19 | -611 |
| 20 | -15 |
| 21 | 1513 |
| 22 | 2021 |
| 23 | -1271 |
| 24 | -6827 |
| 25 | -5673 |
| 26 | 10361 |
| 27 | 28301 |
| 28 | 10141 |
| 29 | -61102 |
| 30 | -107015 |
| 31 | 20109 |
| 32 | 310387 |
| 33 | 356515 |
| 34 | -354349 |
| 35 | -1421913 |
| 36 | -936805 |
| 37 | 2567875 |
| 38 | 5930631 |
| 39 | 972819 |
| 40 | -14696329 |