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 | 3 |
| 2 | 20 |
| 3 | 5797 |
| 4 | 192900159414 |
| 5 | 7177905237579946589743785824843591 |
| 6 | 369822356418414944143680173221426891716916679027557977938929258031497305419444723776968084111223998808 |