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 | 1 |
| 2 | 6 |
| 3 | 18 |
| 4 | 54 |
| 5 | 162 |
| 6 | 486 |
| 7 | 1458 |
| 8 | 1926 |
| 9 | 4374 |
| 10 | 5778 |
| 11 | 13122 |
| 12 | 17334 |
| 13 | 39366 |
| 14 | 52002 |
| 15 | 118098 |
| 16 | 156006 |
| 17 | 206082 |
| 18 | 354294 |
| 19 | 468018 |
| 20 | 618246 |
| 21 | 1062882 |
| 22 | 1404054 |
| 23 | 1854738 |
| 24 | 2471058 |
| 25 | 3188646 |
| 26 | 4212162 |
| 27 | 5564214 |
| 28 | 7413174 |
| 29 | 9565938 |
| 30 | 12636486 |
| 31 | 16692642 |
| 32 | 22050774 |