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 | 4 |
| 3 | 6 |
| 4 | -4 |
| 5 | 0 |
| 6 | -2 |
| 7 | 14 |
| 8 | -4 |
| 9 | -12 |
| 10 | -16 |
| 11 | 44 |
| 12 | 14 |
| 13 | 0 |
| 14 | -66 |
| 15 | 6 |
| 16 | 28 |
| 17 | 102 |
| 18 | -92 |
| 19 | -38 |
| 20 | -24 |
| 21 | 188 |
| 22 | -84 |
| 23 | -46 |
| 24 | -226 |
| 25 | 300 |
| 26 | 108 |
| 27 | 96 |
| 28 | -690 |
| 29 | 232 |
| 30 | 218 |
| 31 | 806 |
| 32 | -996 |
| 33 | -280 |
| 34 | -438 |
| 35 | 2114 |
| 36 | -652 |
| 37 | -518 |
| 38 | -2542 |
| 39 | 3282 |
| 40 | 616 |
| 41 | 1312 |
| 42 | -6792 |
| 43 | 2322 |
| 44 | 1580 |
| 45 | 8538 |
| 46 | -10714 |
| 47 | -1974 |
| 48 | -4514 |
| 49 | 21868 |
| 50 | -7916 |
| 51 | -3972 |
| 52 | -27356 |
| 53 | 34556 |