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 | 1 |
| 2 | 9 |
| 3 | 9 |
| 4 | 45 |
| 5 | 9 |
| 6 | 405 |
| 7 | 15 |
| 8 | 189 |
| 9 | 81 |
| 10 | 729 |
| 11 | 27 |
| 12 | 6075 |
| 13 | 27 |
| 14 | 1215 |
| 15 | 2025 |
| 16 | 729 |
| 17 | 81 |
| 18 | 45927 |
| 19 | 27 |
| 20 | 32805 |
| 21 | 2025 |
| 22 | 6561 |
| 23 | 81 |
| 24 | 229635 |
| 25 | 243 |
| 26 | 2187 |
| 27 | 2187 |
| 28 | 18225 |
| 29 | 9 |
| 30 | 7381125 |
| 31 | 243 |
| 32 | 24057 |
| 33 | 2187 |
| 34 | 19683 |
| 35 | 3645 |
| 36 | 6200145 |
| 37 | 729 |
| 38 | 19683 |
| 39 | 19683 |
| 40 | 1240029 |
| 41 | 81 |
| 42 | 22143375 |
| 43 | 243 |
| 44 | 295245 |
| 45 | 492075 |
| 46 | 19683 |