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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | -3 |
| 5 | -6 |
| 6 | -2 |
| 7 | -2 |
| 8 | 7 |
| 9 | 25 |
| 10 | 0 |
| 11 | 6 |
| 12 | 12 |
| 13 | -9 |
| 14 | -84 |
| 15 | 4 |
| 16 | 4 |
| 17 | -14 |
| 18 | -50 |
| 19 | -23 |
| 20 | 229 |
| 21 | 0 |
| 22 | -12 |
| 23 | -24 |
| 24 | 18 |
| 25 | 168 |
| 26 | 237 |
| 27 | -450 |
| 28 | -8 |
| 29 | -8 |
| 30 | 28 |
| 31 | 100 |
| 32 | 46 |
| 33 | -458 |
| 34 | -1169 |
| 35 | 181 |
| 36 | 0 |
| 37 | 24 |
| 38 | 48 |
| 39 | -36 |
| 40 | -336 |
| 41 | -474 |
| 42 | 900 |
| 43 | 4407 |
| 44 | 3864 |
| 45 | 16 |
| 46 | 16 |
| 47 | -56 |
| 48 | -200 |
| 49 | -92 |
| 50 | 916 |
| 51 | 2338 |
| 52 | -362 |
| 53 | -13583 |
| 54 | -25175 |
| 55 | 0 |
| 56 | -48 |