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 | 13 |
| 2 | 13 |
| 3 | 37 |
| 4 | 116 |
| 5 | 404 |
| 6 | 1246 |
| 7 | 3788 |
| 8 | 12342 |
| 9 | 39252 |
| 10 | 122156 |
| 11 | 388150 |
| 12 | 1234248 |
| 13 | 3885916 |
| 14 | 12284744 |
| 15 | 38942904 |
| 16 | 123064868 |
| 17 | 388956186 |
| 18 | 1231020108 |
| 19 | 3893434762 |
| 20 | 12310010474 |
| 21 | 38938978286 |
| 22 | 123164661778 |
| 23 | 389498928546 |
| 24 | 1231896735244 |
| 25 | 3896353516054 |