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 | 1 |
| 4 | 0 |
| 5 | -1 |
| 6 | -2 |
| 7 | -3 |
| 8 | -3 |
| 9 | -2 |
| 10 | -5 |
| 11 | -3 |
| 12 | 0 |
| 13 | 3 |
| 14 | 5 |
| 15 | 16 |
| 16 | 21 |
| 17 | 24 |
| 18 | 24 |
| 19 | 21 |
| 20 | 16 |
| 21 | 61 |
| 22 | 45 |
| 23 | 24 |
| 24 | 0 |
| 25 | -24 |
| 26 | -45 |
| 27 | -61 |
| 28 | -272 |
| 29 | -333 |
| 30 | -378 |
| 31 | -402 |
| 32 | -402 |
| 33 | -378 |
| 34 | -333 |
| 35 | -272 |
| 36 | -1385 |
| 37 | -1113 |
| 38 | -780 |
| 39 | -402 |
| 40 | 0 |
| 41 | 402 |
| 42 | 780 |
| 43 | 1113 |
| 44 | 1385 |
| 45 | 7936 |
| 46 | 9321 |
| 47 | 10434 |
| 48 | 11214 |
| 49 | 11616 |
| 50 | 11616 |
| 51 | 11214 |
| 52 | 10434 |
| 53 | 9321 |
| 54 | 7936 |