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 | 192 |
| 3 | 3960 |
| 4 | 100656 |
| 5 | 3048192 |
| 6 | 107255232 |
| 7 | 4302305280 |
| 8 | 193836779136 |
| 9 | 9693022090752 |
| 10 | 532784148728832 |
| 11 | 31930395433896960 |
| 12 | 2072320885985366016 |
| 13 | 144803002560595771392 |
| 14 | 10838696766561262190592 |
| 15 | 865256088684973495910400 |
| 16 | 73383436891415208719056896 |