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 | 27 |
| 5 | 81 |
| 6 | 111 |
| 7 | 243 |
| 8 | 333 |
| 9 | 729 |
| 10 | 999 |
| 11 | 2187 |
| 12 | 2997 |
| 13 | 4107 |
| 14 | 6561 |
| 15 | 8991 |
| 16 | 12321 |
| 17 | 13203 |
| 18 | 19683 |
| 19 | 20439 |
| 20 | 26973 |
| 21 | 36963 |
| 22 | 39609 |
| 23 | 59049 |
| 24 | 61317 |
| 25 | 80919 |
| 26 | 110889 |
| 27 | 118827 |
| 28 | 151959 |
| 29 | 177147 |
| 30 | 183951 |
| 31 | 242757 |
| 32 | 332667 |
| 33 | 356481 |
| 34 | 455877 |
| 35 | 488511 |
| 36 | 531441 |
| 37 | 551853 |
| 38 | 728271 |