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 | 5 |
| 2 | 16810 |
| 3 | 10609215 |
| 4 | 4381392020 |
| 5 | 1562500000000 |
| 6 | 522217835532030 |
| 7 | 168437773747672835 |
| 8 | 53095647535975155240 |
| 9 | 16463182598208445194045 |
| 10 | 5040439500800000000000000 |
| 11 | 1527650417538030913166754055 |
| 12 | 459160235715332056282793308860 |