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) |
|---|---|
| 1 | 0 |
| 2 | -1 |
| 3 | 0 |
| 4 | -2 |
| 5 | 0 |
| 6 | -4 |
| 7 | 0 |
| 8 | -7 |
| 9 | 1 |
| 10 | -11 |
| 11 | 3 |
| 12 | -18 |
| 13 | 6 |
| 14 | -28 |
| 15 | 13 |
| 16 | -42 |
| 17 | 24 |
| 18 | -64 |
| 19 | 41 |
| 20 | -96 |
| 21 | 69 |
| 22 | -141 |
| 23 | 112 |
| 24 | -208 |
| 25 | 175 |
| 26 | -303 |
| 27 | 271 |
| 28 | -437 |
| 29 | 410 |
| 30 | -629 |
| 31 | 609 |
| 32 | -898 |
| 33 | 896 |
| 34 | -1271 |
| 35 | 1302 |
| 36 | -1792 |
| 37 | 1868 |
| 38 | -2510 |
| 39 | 2660 |
| 40 | -3493 |
| 41 | 3752 |
| 42 | -4839 |
| 43 | 5248 |
| 44 | -6666 |
| 45 | 7293 |
| 46 | -9131 |
| 47 | 10065 |
| 48 | -12454 |