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) |
|---|---|
| 4 | 5 |
| 5 | 25 |
| 6 | 127 |
| 7 | 670 |
| 8 | 3702 |
| 9 | 21485 |
| 10 | 131007 |
| 11 | 838485 |
| 12 | 5624233 |
| 13 | 39465366 |
| 14 | 289162042 |
| 15 | 2208190845 |
| 16 | 17544083557 |
| 17 | 144774580209 |
| 18 | 1238893540107 |
| 19 | 10977721223490 |
| 20 | 100583317230394 |
| 21 | 951731543130505 |
| 22 | 9288688865151775 |
| 23 | 93402218357061709 |
| 24 | 966643007728282629 |
| 25 | 10286173737875876050 |