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 | 1 |
| 2 | 6 |
| 3 | 40 |
| 4 | 300 |
| 5 | 2400 |
| 6 | 20000 |
| 7 | 171429 |
| 8 | 1500004 |
| 9 | 13333369 |
| 10 | 1200003211 |
| 11 | 10909120100 |
| 12 | 100000267584 |
| 13 | 9230793930832 |
| 14 | 85714515072012 |
| 15 | 8000021406721121 |
| 16 | 750002006880105095 |
| 17 | 7058842417695106777 |
| 18 | 66666845056009341783 |