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 | 4 |
| 3 | 1211 |
| 4 | 6907736 |
| 5 | 423503301834 |
| 6 | 274342896958292170 |
| 7 | 1877611081501313948217870 |
| 8 | 135766460737448561825230968357842 |