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 | 9 |
| 2 | 27 |
| 3 | 81 |
| 4 | 243 |
| 5 | 249 |
| 6 | 729 |
| 7 | 747 |
| 8 | 1149 |
| 9 | 2187 |
| 10 | 2241 |
| 11 | 2649 |
| 12 | 3447 |
| 13 | 6561 |
| 14 | 6723 |
| 15 | 6889 |
| 16 | 7947 |
| 17 | 10341 |
| 18 | 11499 |
| 19 | 19683 |
| 20 | 20169 |
| 21 | 20667 |
| 22 | 23841 |
| 23 | 31023 |
| 24 | 31789 |
| 25 | 34497 |
| 26 | 59049 |
| 27 | 60507 |
| 28 | 62001 |
| 29 | 71523 |
| 30 | 73289 |
| 31 | 93069 |
| 32 | 95367 |
| 33 | 103491 |
| 34 | 114999 |
| 35 | 116499 |
| 36 | 146689 |
| 37 | 177147 |