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) |
|---|---|
| 3 | 5 |
| 4 | 28 |
| 5 | 190 |
| 6 | 1340 |
| 7 | 9065 |
| 8 | 57512 |
| 9 | 344316 |
| 10 | 1966440 |
| 11 | 10813935 |
| 12 | 57672340 |
| 13 | 299893594 |
| 14 | 1526727748 |
| 15 | 7633634645 |
| 16 | 37580965520 |
| 17 | 182536112120 |
| 18 | 876173330832 |
| 19 | 4161823312731 |
| 20 | 19585050873180 |
| 21 | 91396904062870 |
| 22 | 423311976698380 |
| 23 | 1947235092796609 |
| 24 | 8901646138480568 |