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 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 24 |
| 4 | 256 |
| 5 | 4000 |
| 6 | 82944 |
| 7 | 2151296 |
| 8 | 67108864 |
| 9 | 2448880128 |
| 10 | 102400000000 |
| 11 | 4829076871168 |
| 12 | 253613523861504 |
| 13 | 14681377947951104 |
| 14 | 928873060356849664 |
| 15 | 63772920000000000000 |
| 16 | 4722366482869645213696 |
| 17 | 375183514207494575620096 |