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 | 5 |
| 1 | 13 |
| 2 | 37 |
| 3 | 109 |
| 4 | 325 |
| 5 | 973 |
| 6 | 2917 |
| 7 | 8749 |
| 8 | 26245 |
| 9 | 78733 |
| 10 | 236197 |
| 11 | 708589 |
| 12 | 2125765 |
| 13 | 6377293 |
| 14 | 19131877 |
| 15 | 57395629 |
| 16 | 172186885 |
| 17 | 516560653 |
| 18 | 1549681957 |
| 19 | 4649045869 |
| 20 | 13947137605 |
| 21 | 41841412813 |
| 22 | 125524238437 |
| 23 | 376572715309 |
| 24 | 1129718145925 |
| 25 | 3389154437773 |
| 26 | 10167463313317 |
| 27 | 30502389939949 |