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 | 9 |
| 3 | 109 |
| 4 | 296848141 |
| 5 | 4341833151859 |
| 6 | 3399291958357679641 |
| 7 | 2412237158970509643109 |