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 | 3 |
| 3 | 19 |
| 4 | 689 |
| 5 | 902919 |
| 6 | 1610893922869 |
| 7 | 5422187846648306990942459 |
| 8 | 65408471597507349805723190837012905483968615226329 |