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 | 12 |
| 2 | 264 |
| 3 | 9056 |
| 4 | 379224 |
| 5 | 17519904 |
| 6 | 858968640 |
| 7 | 43860112128 |
| 8 | 2307187351512 |
| 9 | 124161781334048 |
| 10 | 6803252453289408 |
| 11 | 378260174003539200 |
| 12 | 21287072393719585216 |
| 13 | 1210206988807094340864 |
| 14 | 69402141007670673363456 |