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 | 6 |
| 3 | 18 |
| 4 | 45 |
| 5 | 135 |
| 6 | 378 |
| 7 | 1134 |
| 8 | 3324 |
| 9 | 9981 |
| 10 | 29733 |
| 11 | 89280 |
| 12 | 267273 |