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 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 21 |
| 5 | 33 |
| 6 | 129 |
| 7 | 159 |
| 8 | 3066835 |
| 9 | 3067195 |
| 10 | 3067255 |
| 11 | 3067615 |
| 12 | 3067745 |
| 13 | 3068045 |
| 14 | 44690978227 |
| 15 | 44690978647 |
| 16 | 44690978983 |
| 17 | 44690979529 |