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 | 1 |
| 3 | 112 |
| 4 | 4832 |
| 5 | 39929032 |
| 6 | 6227388000 |
| 7 | 355687500698712 |
| 8 | 121674349040732800 |
| 9 | 26204303786955547121568 |
| 10 | 8844022735747817449795273936944 |
| 11 | 8243360285859647409507002537385024 |
| 12 | 13989390090648918627329493090109449081402880 |
| 13 | 33452526614068666040537953433982904696696861440000 |