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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | -5 |
| 6 | 5 |
| 7 | 0 |
| 8 | 0 |
| 9 | -9 |
| 10 | 19 |
| 11 | -10 |
| 12 | 0 |
| 13 | -13 |
| 14 | 58 |
| 15 | -55 |
| 16 | 10 |
| 17 | -17 |
| 18 | 118 |
| 19 | -191 |
| 20 | 95 |
| 21 | -26 |
| 22 | 223 |
| 23 | -512 |
| 24 | 400 |
| 25 | -116 |
| 26 | 362 |
| 27 | -1175 |
| 28 | 1329 |
| 29 | -564 |
| 30 | 609 |
| 31 | -2368 |
| 32 | 3593 |
| 33 | -2218 |
| 34 | 1246 |
| 35 | -4402 |
| 36 | 8600 |
| 37 | -7118 |
| 38 | 3433 |
| 39 | -7792 |
| 40 | 18503 |
| 41 | -19778 |
| 42 | 10702 |
| 43 | -13924 |
| 44 | 37009 |
| 45 | -49017 |
| 46 | 32097 |
| 47 | -27141 |