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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 19 |
| 6 | 79 |
| 7 | 159 |
| 8 | 319 |
| 9 | 1279 |
| 10 | 10239 |
| 11 | 20479 |
| 12 | 40959 |
| 13 | 163839 |
| 14 | 1310719 |
| 15 | 5242879 |
| 16 | 10485759 |