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 | 3 |
| 2 | 31 |
| 3 | 103 |
| 4 | 113 |
| 5 | 123 |
| 6 | 133 |
| 7 | 143 |
| 8 | 153 |
| 9 | 163 |
| 10 | 173 |
| 11 | 183 |
| 12 | 193 |
| 13 | 203 |
| 14 | 303 |
| 15 | 311 |
| 16 | 403 |
| 17 | 503 |
| 18 | 603 |
| 19 | 703 |
| 20 | 803 |
| 21 | 903 |
| 22 | 1031 |
| 23 | 1131 |
| 24 | 1231 |
| 25 | 1331 |
| 26 | 1431 |
| 27 | 1531 |
| 28 | 1631 |
| 29 | 1731 |
| 30 | 1831 |
| 31 | 1931 |
| 32 | 2031 |
| 33 | 3031 |
| 34 | 3100 |
| 35 | 3110 |
| 36 | 3111 |
| 37 | 3112 |
| 38 | 3113 |
| 39 | 3114 |
| 40 | 3115 |
| 41 | 3116 |
| 42 | 3117 |
| 43 | 3118 |
| 44 | 3119 |
| 45 | 3120 |
| 46 | 3130 |
| 47 | 3140 |