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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 63 |
| 3 | 16081 |
| 4 | 10681263 |
| 5 | 14638956721 |
| 6 | 35941784497263 |
| 7 | 143743469278461361 |
| 8 | 874531783382503604463 |
| 9 | 7687300579969605991710001 |
| 10 | 93777824804632275267836362863 |
| 11 | 1537173608464960118370398000894641 |
| 12 | 32970915649974341628739088902163732463 |