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 | -2 |
| 4 | -2 |
| 5 | -2 |
| 6 | 0 |
| 7 | 2 |
| 8 | 7 |
| 9 | 8 |
| 10 | 12 |
| 11 | 10 |
| 12 | 9 |
| 13 | -2 |
| 14 | -10 |
| 15 | -32 |
| 16 | -40 |
| 17 | -62 |
| 18 | -62 |
| 19 | -70 |
| 20 | -37 |
| 21 | -20 |
| 22 | 57 |
| 23 | 106 |
| 24 | 224 |
| 25 | 272 |
| 26 | 388 |
| 27 | 376 |
| 28 | 431 |
| 29 | 272 |
| 30 | 192 |
| 31 | -184 |
| 32 | -414 |
| 33 | -1012 |
| 34 | -1321 |
| 35 | -2020 |
| 36 | -2157 |
| 37 | -2700 |
| 38 | -2318 |
| 39 | -2352 |
| 40 | -1014 |
| 41 | -272 |
| 42 | 2280 |
| 43 | 3798 |
| 44 | 7464 |
| 45 | 9200 |
| 46 | 13257 |
| 47 | 13958 |
| 48 | 17098 |
| 49 | 14846 |
| 50 | 15266 |