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 | 3 |
| 3 | 7 |
| 4 | 39916801 |
| 5 | 10888869450418352160768000001 |
| 6 | 13763753091226345046315979581580902400000001 |
| 7 | 33452526613163807108170062053440751665152000000001 |