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 | 10 |
| 3 | 276 |
| 4 | 22496 |
| 5 | 5477312 |
| 6 | 3995536896 |
| 7 | 8740106791936 |
| 8 | 57347917373194240 |
| 9 | 1128805788065906196480 |
| 10 | 66655379003341682687344640 |
| 11 | 11807831483305724934163060490240 |
| 12 | 6275171273199511284527725270165094400 |
| 13 | 10004652813703079731923092657993740504268800 |