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 | -2 |
| 2 | 1 |
| 3 | 4 |
| 4 | -4 |
| 5 | 1 |
| 6 | -10 |
| 7 | 13 |
| 8 | -6 |
| 9 | 1 |
| 10 | 28 |
| 11 | -42 |
| 12 | 26 |
| 13 | -8 |
| 14 | 1 |
| 15 | -84 |
| 16 | 138 |
| 17 | -102 |
| 18 | 43 |
| 19 | -10 |
| 20 | 1 |
| 21 | 264 |
| 22 | -462 |
| 23 | 385 |
| 24 | -198 |
| 25 | 64 |
| 26 | -12 |
| 27 | 1 |
| 28 | -858 |
| 29 | 1573 |
| 30 | -1430 |
| 31 | 845 |
| 32 | -338 |
| 33 | 89 |
| 34 | -14 |
| 35 | 1 |
| 36 | 2860 |
| 37 | -5434 |
| 38 | 5278 |
| 39 | -3458 |
| 40 | 1610 |
| 41 | -530 |
| 42 | 118 |
| 43 | -16 |
| 44 | 1 |
| 45 | -9724 |
| 46 | 19006 |
| 47 | -19448 |
| 48 | 13804 |
| 49 | -7208 |
| 50 | 2788 |
| 51 | -782 |
| 52 | 151 |
| 53 | -18 |
| 54 | 1 |
| 55 | 33592 |