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 | 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 |
| 2 | 1100100 |
| 3 | 10201 |
| 4 | 1210 |
| 5 | 400 |
| 6 | 244 |
| 7 | 202 |
| 8 | 144 |
| 9 | 121 |
| 10 | 100 |
| 11 | 91 |
| 12 | 84 |
| 13 | 79 |
| 14 | 72 |
| 15 | -1 |
| 16 | 64 |
| 17 | -1 |
| 18 | -1 |
| 19 | 55 |
| 20 | 50 |
| 21 | -1 |
| 22 | -1 |
| 23 | 48 |
| 24 | 44 |
| 25 | 40 |
| 26 | -1 |
| 27 | -1 |
| 28 | -1 |
| 29 | -1 |
| 30 | -1 |
| 31 | 37 |
| 32 | 34 |
| 33 | 31 |
| 34 | -1 |
| 35 | -1 |
| 36 | -1 |
| 37 | -1 |
| 38 | -1 |
| 39 | -1 |
| 40 | -1 |
| 41 | -1 |
| 42 | -1 |
| 43 | -1 |
| 44 | -1 |
| 45 | -1 |
| 46 | 28 |
| 47 | 26 |
| 48 | 24 |
| 49 | 22 |
| 50 | 20 |
| 51 | -1 |
| 52 | -1 |
| 53 | -1 |
| 54 | -1 |
| 55 | -1 |
| 56 | -1 |
| 57 | -1 |
| 58 | -1 |
| 59 | -1 |
| 60 | -1 |
| 61 | -1 |
| 62 | -1 |
| 63 | -1 |
| 64 | -1 |
| 65 | -1 |
| 66 | -1 |
| 67 | -1 |
| 68 | -1 |
| 69 | -1 |
| 70 | -1 |
| 71 | -1 |
| 72 | -1 |
| 73 | -1 |
| 74 | -1 |
| 75 | -1 |
| 76 | -1 |
| 77 | -1 |
| 78 | -1 |
| 79 | -1 |
| 80 | -1 |
| 81 | -1 |
| 82 | -1 |
| 83 | -1 |
| 84 | -1 |
| 85 | -1 |
| 86 | -1 |
| 87 | -1 |
| 88 | -1 |
| 89 | -1 |
| 90 | -1 |
| 91 | 19 |
| 92 | 18 |
| 93 | 17 |
| 94 | 16 |
| 95 | 15 |
| 96 | 14 |
| 97 | 13 |
| 98 | 12 |
| 99 | 11 |
| 100 | 10 |