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 | -1 |
| 2 | 1 |
| 3 | -1 |
| 4 | -3 |
| 5 | 3 |
| 6 | -3 |
| 7 | -4 |
| 8 | 14 |
| 9 | -14 |
| 10 | 4 |
| 11 | 24 |
| 12 | -44 |
| 13 | 31 |
| 14 | 37 |
| 15 | -107 |
| 16 | 126 |
| 17 | -4 |
| 18 | -208 |
| 19 | 329 |
| 20 | -175 |
| 21 | -319 |
| 22 | 777 |
| 23 | -704 |
| 24 | -236 |
| 25 | 1507 |
| 26 | -1945 |
| 27 | 430 |
| 28 | 2532 |
| 29 | -4575 |
| 30 | 2781 |
| 31 | 3236 |
| 32 | -9301 |
| 33 | 8697 |
| 34 | 2085 |
| 35 | -16902 |
| 36 | 21804 |
| 37 | -5233 |
| 38 | -26573 |
| 39 | 47225 |
| 40 | -27047 |
| 41 | -34332 |
| 42 | 92242 |
| 43 | -80162 |
| 44 | -26926 |
| 45 | 162426 |