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 | 4 |
| 2 | 104 |
| 3 | 6544 |
| 4 | 765344 |
| 5 | 143639104 |
| 6 | 39511297664 |
| 7 | 14979797833984 |
| 8 | 7487442077817344 |
| 9 | 4770988535512474624 |
| 10 | 3774873839360539879424 |
| 11 | 3630982576832133263233024 |
| 12 | 4172729918808369709126098944 |