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 | 3 |
| 2 | 3 |
| 3 | 9 |
| 4 | 5 |
| 5 | 15 |
| 6 | 9 |
| 7 | 21 |
| 8 | 9 |
| 9 | 27 |
| 10 | 15 |
| 11 | 27 |
| 12 | 15 |
| 13 | 27 |
| 14 | 21 |
| 15 | 45 |
| 16 | 17 |
| 17 | 51 |
| 18 | 27 |
| 19 | 99 |
| 20 | 99 |
| 21 | 63 |
| 22 | -1 |
| 23 | 63 |
| 24 | 27 |
| 25 | 99 |
| 26 | -1 |
| 27 | 255 |
| 28 | -1 |
| 29 | 63 |
| 30 | 45 |
| 31 | 93 |
| 32 | 33 |
| 33 | 99 |
| 34 | 51 |
| 35 | -1 |
| 36 | 45 |
| 37 | -1 |
| 38 | 63 |
| 39 | 99 |
| 40 | 45 |
| 41 | -1 |
| 42 | 63 |
| 43 | 99 |
| 44 | 99 |
| 45 | -1 |
| 46 | -1 |
| 47 | -1 |
| 48 | 51 |
| 49 | -1 |
| 50 | 255 |
| 51 | 153 |
| 52 | 63 |
| 53 | 99 |
| 54 | 255 |
| 55 | 153 |
| 56 | 63 |
| 57 | 99 |
| 58 | 255 |
| 59 | 153 |
| 60 | -1 |
| 61 | -1 |
| 62 | 93 |
| 63 | 189 |
| 64 | 65 |
| 65 | 195 |
| 66 | 99 |
| 67 | -1 |
| 68 | 85 |
| 69 | 255 |
| 70 | 119 |
| 71 | 387 |
| 72 | 255 |
| 73 | 219 |
| 74 | 13299 |
| 75 | -1 |
| 76 | 387 |
| 77 | -1 |
| 78 | -1 |
| 79 | 219 |