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 | 2 |
| 3 | 3 |
| 4 | 9 |
| 5 | 14 |
| 6 | 27 |
| 7 | 81 |
| 8 | 98 |
| 9 | 99 |
| 10 | 153 |
| 11 | 243 |
| 12 | 621 |
| 13 | 686 |
| 14 | 729 |
| 15 | 1199 |
| 16 | 2187 |
| 17 | 4018 |
| 18 | 4802 |
| 19 | 5049 |
| 20 | 6561 |
| 21 | 8019 |
| 22 | 12393 |
| 23 | 19683 |
| 24 | 20541 |
| 25 | 31509 |
| 26 | 33614 |
| 27 | 59049 |
| 28 | 70389 |
| 29 | 82377 |
| 30 | 113974 |
| 31 | 150903 |
| 32 | 177147 |
| 33 | 226557 |
| 34 | 235298 |
| 35 | 299619 |
| 36 | 308014 |
| 37 | 340443 |
| 38 | 408969 |
| 39 | 423929 |
| 40 | 531441 |