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 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 8 |
| 5 | 12 |
| 6 | 14 |
| 7 | 18 |
| 8 | 36 |
| 9 | 68 |
| 10 | 152 |
| 11 | 212 |
| 12 | 324 |
| 13 | 1434 |
| 14 | 1592 |
| 15 | 1668 |
| 16 | 3338 |
| 17 | 7908 |
| 18 | 9662 |
| 19 | 27968 |
| 20 | 28116 |
| 21 | 33974 |
| 22 | 41774 |
| 23 | 66804 |
| 24 | 144518 |
| 25 | 162954 |
| 26 | 241032 |
| 27 | 366218 |
| 28 | 676592 |
| 29 | 991968 |