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 | 27 |
| 3 | 243 |
| 4 | 2187 |
| 5 | 19683 |
| 6 | 177147 |
| 7 | 1594323 |
| 8 | 14348907 |
| 9 | 129140163 |
| 10 | 1162261467 |
| 11 | 10460353203 |
| 12 | 94143178827 |
| 13 | 847288609443 |
| 14 | 7625597484987 |
| 15 | 68630377364883 |
| 16 | 617673396283947 |
| 17 | 5559060566555523 |
| 18 | 50031545098999707 |
| 19 | 450283905890997363 |
| 20 | 4052555153018976267 |
| 21 | 36472996377170786403 |