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 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 1316 |
| 4 | 840124672 |
| 5 | 6110726696100443604557936 |
| 6 | 439451426203104201222708341688051362423089952907263634936946272224 |