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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 12 |
| 3 | 27 |
| 4 | 108 |
| 5 | 243 |
| 6 | 972 |
| 7 | 2187 |
| 8 | 8748 |
| 9 | 19683 |
| 10 | 78732 |
| 11 | 177147 |
| 12 | 708588 |
| 13 | 1594323 |
| 14 | 6377292 |
| 15 | 14348907 |
| 16 | 57395628 |
| 17 | 129140163 |
| 18 | 516560652 |
| 19 | 1162261467 |
| 20 | 4649045868 |
| 21 | 10460353203 |
| 22 | 41841412812 |
| 23 | 94143178827 |
| 24 | 376572715308 |
| 25 | 847288609443 |
| 26 | 3389154437772 |
| 27 | 7625597484987 |
| 28 | 30502389939948 |