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 | 33 |
| 6 | 81 |
| 7 | 99 |
| 8 | 243 |
| 9 | 297 |
| 10 | 333 |
| 11 | 729 |
| 12 | 891 |
| 13 | 999 |
| 14 | 1089 |
| 15 | 2187 |
| 16 | 2673 |
| 17 | 2997 |
| 18 | 3267 |
| 19 | 3333 |
| 20 | 6561 |
| 21 | 8019 |
| 22 | 8991 |
| 23 | 9801 |
| 24 | 9999 |
| 25 | 10989 |
| 26 | 19683 |
| 27 | 24057 |
| 28 | 26973 |
| 29 | 29403 |
| 30 | 29997 |
| 31 | 32967 |
| 32 | 33333 |
| 33 | 35937 |
| 34 | 59049 |
| 35 | 72171 |
| 36 | 80919 |
| 37 | 88209 |
| 38 | 89991 |
| 39 | 98901 |
| 40 | 99999 |
| 41 | 107811 |