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) |
|---|---|
| 2 | 18 |
| 3 | 154 |
| 4 | 19040 |
| 5 | 267140 |
| 6 | 2853326516320 |
| 7 | 3360633 |