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 | 27 |
| 4 | 1755 |
| 5 | 6909435 |
| 6 | 106751109312315 |
| 7 | 25481781981232427172041948475 |
| 8 | 1451926371364357751230060437820316313546007023604937430075 |