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 | 2 |
| 5 | -2 |
| 6 | 3 |
| 7 | -4 |
| 8 | 7 |
| 9 | -8 |
| 10 | 11 |
| 11 | -15 |
| 12 | 22 |
| 13 | -27 |
| 14 | 37 |
| 15 | -51 |
| 16 | 70 |
| 17 | -90 |
| 18 | 121 |
| 19 | -162 |
| 20 | 220 |
| 21 | -288 |
| 22 | 381 |
| 23 | -512 |
| 24 | 688 |
| 25 | -902 |
| 26 | 1197 |
| 27 | -1598 |
| 28 | 2127 |
| 29 | -2809 |
| 30 | 3722 |
| 31 | -4949 |
| 32 | 6581 |
| 33 | -8699 |
| 34 | 11519 |
| 35 | -15301 |
| 36 | 20305 |
| 37 | -26862 |
| 38 | 35581 |
| 39 | -47208 |
| 40 | 62591 |
| 41 | -82859 |
| 42 | 109756 |
| 43 | -145506 |
| 44 | 192856 |
| 45 | -255388 |