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 | 2 |
| 2 | 2 |
| 3 | 10 |
| 4 | 52246 |
| 5 | 2631645209645100680144 |
| 6 | 312242081385925594286511113384607360432260178128338777217975928751832 |