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 | 26 |
| 4 | 76 |
| 5 | 223 |
| 6 | 658 |
| 7 | 1948 |
| 8 | 5782 |
| 9 | 17193 |
| 10 | 51194 |
| 11 | 152594 |
| 12 | 455209 |
| 13 | 1358841 |
| 14 | 4058439 |
| 15 | 12126696 |
| 16 | 36248370 |
| 17 | 108385917 |
| 18 | 324172566 |
| 19 | 969801726 |
| 20 | 2901883611 |
| 21 | 8684735577 |
| 22 | 25995833145 |
| 23 | 77824036620 |
| 24 | 233012973051 |
| 25 | 697745695923 |