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 | 2 |
| 3 | 4 |
| 4 | 33 |
| 5 | 394025 |
| 6 | 201957164678370265209 |
| 7 | 84193682293466007059985338904628711064119559738613309218248322664618484704217611109073 |