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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 512 |
| 5 | 513 |
| 6 | 1024 |
| 7 | 19683 |
| 8 | 19684 |
| 9 | 20195 |
| 10 | 39366 |
| 11 | 262144 |
| 12 | 262145 |
| 13 | 262656 |
| 14 | 281827 |
| 15 | 524288 |
| 16 | 1953125 |
| 17 | 1953126 |
| 18 | 1953637 |
| 19 | 1972808 |
| 20 | 2215269 |
| 21 | 3906250 |
| 22 | 10077696 |
| 23 | 10077697 |
| 24 | 10078208 |
| 25 | 10097379 |
| 26 | 10339840 |
| 27 | 12030821 |
| 28 | 20155392 |
| 29 | 40353607 |
| 30 | 40353608 |