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 | 3 |
| 2 | 14 |
| 3 | 42 |
| 4 | 141 |
| 5 | 399 |
| 6 | 1274 |
| 7 | 4123 |
| 8 | 12688 |
| 9 | 39604 |
| 10 | 124987 |
| 11 | 392908 |
| 12 | 1233059 |
| 13 | 3869012 |