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) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 25 |
| 3 | 101 |
| 4 | 361 |
| 5 | 1205 |
| 6 | 3865 |
| 7 | 12101 |
| 8 | 37321 |
| 9 | 114005 |
| 10 | 346105 |
| 11 | 1046501 |
| 12 | 3155881 |
| 13 | 9500405 |
| 14 | 28566745 |
| 15 | 85831301 |
| 16 | 257756041 |
| 17 | 773792405 |
| 18 | 2322425785 |
| 19 | 6969374501 |
| 20 | 20912317801 |
| 21 | 62745342005 |
| 22 | 188252803225 |
| 23 | 564791964101 |
| 24 | 1694443001161 |
| 25 | 5083463221205 |
| 26 | 15250658099065 |