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 | 9 |
| 3 | 27 |
| 4 | 35 |
| 5 | 39 |
| 6 | 55 |
| 7 | 81 |
| 8 | 243 |
| 9 | 279 |
| 10 | 387 |
| 11 | 715 |
| 12 | 729 |
| 13 | 1443 |
| 14 | 2187 |
| 15 | 2619 |
| 16 | 3655 |
| 17 | 5635 |
| 18 | 6561 |
| 19 | 10855 |
| 20 | 12635 |
| 21 | 19683 |
| 22 | 59049 |
| 23 | 77283 |
| 24 | 177147 |
| 25 | 178119 |
| 26 | 294759 |
| 27 | 443135 |
| 28 | 531441 |
| 29 | 817167 |
| 30 | 1170723 |
| 31 | 1594323 |
| 32 | 1605987 |
| 33 | 1632231 |
| 34 | 1710963 |
| 35 | 1947159 |
| 36 | 2410239 |
| 37 | 2624375 |
| 38 | 2655747 |
| 39 | 3944255 |