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 | 13 |
| 2 | 28561 |
| 3 | 10604499373 |
| 4 | 665416609183179841 |
| 5 | 7056410014866816666030739693 |
| 6 | 12646218552730347184269489080961456410641 |
| 7 | 3830224792147131369362629348887201408953937846517364173 |