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 | 2 |
| 1 | -1 |
| 2 | 1 |
| 3 | -1 |
| 4 | 4 |
| 5 | -3 |
| 6 | -1 |
| 7 | -1 |
| 8 | 13 |
| 9 | -1 |
| 10 | -7 |
| 11 | -10 |
| 12 | 10 |
| 13 | -1 |
| 14 | 22 |
| 15 | -1 |
| 16 | 10 |
| 17 | -23 |
| 18 | -25 |
| 19 | -1 |
| 20 | 43 |
| 21 | -1 |
| 22 | 50 |
| 23 | -36 |
| 24 | 14 |
| 25 | -1 |
| 26 | -19 |
| 27 | -26 |
| 28 | 16 |
| 29 | -55 |
| 30 | 78 |
| 31 | -1 |
| 32 | 201 |
| 33 | -1 |
| 34 | -129 |
| 35 | -78 |
| 36 | 20 |
| 37 | -108 |
| 38 | 211 |
| 39 | -1 |
| 40 | 22 |
| 41 | -105 |
| 42 | 9 |
| 43 | -1 |
| 44 | 349 |
| 45 | -1 |
| 46 | 274 |
| 47 | -430 |
| 48 | 26 |
| 49 | -1 |
| 50 | -421 |
| 51 | -50 |
| 52 | 568 |
| 53 | -171 |
| 54 | 441 |
| 55 | -1 |
| 56 | 769 |
| 57 | -661 |
| 58 | -238 |
| 59 | -210 |
| 60 | 32 |
| 61 | -1 |
| 62 | 1291 |
| 63 | -1 |
| 64 | 34 |
| 65 | -591 |
| 66 | -897 |
| 67 | -1288 |
| 68 | 1765 |
| 69 | -1 |