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 | 6 |
| 2 | 41 |
| 3 | 259 |
| 4 | 1556 |
| 5 | 8764 |
| 6 | 45907 |
| 7 | 223075 |
| 8 | 1005991 |
| 9 | 4224203 |
| 10 | 16588684 |
| 11 | 61226525 |
| 12 | 213418690 |
| 13 | 705807396 |
| 14 | 2223963956 |
| 15 | 6702140026 |
| 16 | 19383434369 |
| 17 | 53965133477 |
| 18 | 145029252226 |
| 19 | 377163396856 |
| 20 | 951257706522 |
| 21 | 2331468492530 |
| 22 | 5562985385965 |