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 | 3 |
| 2 | 9 |
| 3 | 26 |
| 4 | 77 |
| 5 | 226 |
| 6 | 665 |
| 7 | 1960 |
| 8 | 5769 |
| 9 | 16983 |
| 10 | 49998 |
| 11 | 147198 |
| 12 | 433361 |
| 13 | 1275825 |
| 14 | 3756068 |
| 15 | 11058011 |
| 16 | 32555211 |
| 17 | 95843749 |
| 18 | 282167522 |
| 19 | 830711657 |
| 20 | 2445646047 |
| 21 | 7200072866 |
| 22 | 21197281911 |
| 23 | 62405585330 |
| 24 | 183724361820 |
| 25 | 540891347189 |
| 26 | 1592404221036 |