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 | 3 |
| 3 | 5 |
| 4 | 9 |
| 5 | 15 |
| 6 | 25 |
| 7 | 41 |
| 8 | 1149 |
| 9 | 1755 |
| 10 | 2009 |
| 11 | 2815 |
| 12 | 6981 |
| 13 | 19117 |
| 14 | 65515 |
| 15 | 218715 |
| 16 | 315735 |
| 17 | 405845 |
| 18 | 1511139 |
| 19 | 2165055 |
| 20 | 7076685 |