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 | 3 |
| 3 | 9 |
| 4 | 21 |
| 5 | 27 |
| 6 | 81 |
| 7 | 171 |
| 8 | 189 |
| 9 | 217 |
| 10 | 243 |
| 11 | 297 |
| 12 | 351 |
| 13 | 729 |
| 14 | 903 |
| 15 | 1547 |
| 16 | 2187 |
| 17 | 3591 |
| 18 | 3661 |
| 19 | 4131 |
| 20 | 5499 |
| 21 | 5967 |
| 22 | 6019 |
| 23 | 6561 |
| 24 | 7533 |
| 25 | 8001 |
| 26 | 11997 |
| 27 | 13203 |
| 28 | 14217 |
| 29 | 15309 |
| 30 | 17181 |
| 31 | 19683 |
| 32 | 20601 |
| 33 | 22113 |
| 34 | 22599 |
| 35 | 23529 |
| 36 | 24297 |
| 37 | 25659 |
| 38 | 26163 |
| 39 | 26319 |
| 40 | 26487 |
| 41 | 28441 |
| 42 | 30051 |
| 43 | 33021 |
| 44 | 37179 |
| 45 | 37791 |