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 | 3 |
| 1 | 6 |
| 2 | 14 |
| 3 | 36 |
| 4 | 98 |
| 5 | 276 |
| 6 | 794 |
| 7 | 2316 |
| 8 | 6818 |
| 9 | 20196 |
| 10 | 60074 |
| 11 | 179196 |
| 12 | 535538 |
| 13 | 1602516 |
| 14 | 4799354 |
| 15 | 14381676 |
| 16 | 43112258 |
| 17 | 129271236 |
| 18 | 387682634 |
| 19 | 1162785756 |
| 20 | 3487832978 |
| 21 | 10462450356 |
| 22 | 31385253914 |
| 23 | 94151567436 |
| 24 | 282446313698 |
| 25 | 847322163876 |