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) |
|---|---|
| 0 | 4 |
| 1 | 32 |
| 2 | 512 |
| 3 | 12288 |
| 4 | 393216 |
| 5 | 15728640 |
| 6 | 754974720 |
| 7 | 42278584320 |
| 8 | 2705829396480 |
| 9 | 194819716546560 |
| 10 | 15585577323724800 |
| 11 | 1371530804487782400 |
| 12 | 131666957230827110400 |
| 13 | 13693363552006019481600 |