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 | -4 |
| 2 | -1 |
| 3 | 8 |
| 4 | 1 |
| 5 | -12 |
| 6 | -1 |
| 7 | 16 |
| 8 | 1 |
| 9 | -20 |
| 10 | -1 |
| 11 | 24 |
| 12 | 1 |
| 13 | -28 |
| 14 | -1 |
| 15 | 32 |
| 16 | 1 |
| 17 | -36 |
| 18 | -1 |
| 19 | 40 |
| 20 | 1 |
| 21 | -44 |
| 22 | -1 |
| 23 | 48 |
| 24 | 1 |
| 25 | -52 |
| 26 | -1 |
| 27 | 56 |
| 28 | 1 |
| 29 | -60 |
| 30 | -1 |
| 31 | 64 |
| 32 | 1 |
| 33 | -68 |
| 34 | -1 |
| 35 | 72 |
| 36 | 1 |
| 37 | -76 |
| 38 | -1 |
| 39 | 80 |
| 40 | 1 |
| 41 | -84 |
| 42 | -1 |
| 43 | 88 |
| 44 | 1 |
| 45 | -92 |
| 46 | -1 |
| 47 | 96 |
| 48 | 1 |
| 49 | -100 |
| 50 | -1 |
| 51 | 104 |
| 52 | 1 |
| 53 | -108 |
| 54 | -1 |
| 55 | 112 |
| 56 | 1 |
| 57 | -116 |
| 58 | -1 |
| 59 | 120 |
| 60 | 1 |
| 61 | -124 |
| 62 | -1 |
| 63 | 128 |
| 64 | 1 |
| 65 | -132 |
| 66 | -1 |