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 | 9 |
| 3 | 29 |
| 4 | 95 |
| 5 | 307 |
| 6 | 973 |
| 7 | 3033 |
| 8 | 9339 |
| 9 | 28511 |
| 10 | 86537 |
| 11 | 261637 |
| 12 | 788983 |
| 13 | 2375115 |
| 14 | 7141701 |
| 15 | 21457841 |
| 16 | 64439027 |
| 17 | 193448119 |
| 18 | 580606465 |
| 19 | 1742343645 |
| 20 | 5228079471 |
| 21 | 15686335523 |
| 22 | 47063200829 |
| 23 | 141197991049 |
| 24 | 423610750315 |
| 25 | 1270865805327 |