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 | 24 |
| 5 | 216 |
| 6 | 2184 |
| 7 | 24696 |
| 8 | 310344 |
| 9 | 4304376 |
| 10 | 65444424 |
| 11 | 1083832056 |
| 12 | 19437971784 |
| 13 | 375544415736 |
| 14 | 7779464328264 |
| 15 | 172062025581816 |
| 16 | 4047849158698824 |
| 17 | 100946105980181496 |
| 18 | 2660400563437957704 |
| 19 | 73890563849015945976 |
| 20 | 2157336929022064219464 |
| 21 | 66059202473570840113656 |
| 22 | 2116993226046938197020744 |