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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 6 |
| 5 | 9 |
| 6 | 14 |
| 7 | 15 |
| 8 | 18 |
| 9 | 27 |
| 10 | 41 |
| 11 | 42 |
| 12 | 45 |
| 13 | 54 |
| 14 | 81 |
| 15 | 122 |
| 16 | 123 |
| 17 | 126 |
| 18 | 135 |
| 19 | 162 |
| 20 | 243 |
| 21 | 365 |
| 22 | 366 |
| 23 | 369 |
| 24 | 378 |
| 25 | 405 |
| 26 | 486 |
| 27 | 729 |
| 28 | 1094 |
| 29 | 1095 |
| 30 | 1098 |
| 31 | 1107 |
| 32 | 1134 |
| 33 | 1215 |
| 34 | 1458 |
| 35 | 2187 |
| 36 | 3281 |
| 37 | 3282 |
| 38 | 3285 |
| 39 | 3294 |
| 40 | 3321 |
| 41 | 3402 |
| 42 | 3645 |
| 43 | 4374 |
| 44 | 6561 |
| 45 | 9842 |
| 46 | 9843 |
| 47 | 9846 |
| 48 | 9855 |
| 49 | 9882 |
| 50 | 9963 |
| 51 | 10206 |
| 52 | 10935 |
| 53 | 13122 |
| 54 | 19683 |