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) |
|---|---|
| 3 | 3732480 |
| 4 | 253603223500400479331942400000 |
| 5 | 66038535945066815418194228229716898861828197815802983951534337590785326501068800000000000000000 |