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 | 180 |
| 3 | 3240 |
| 4 | 68040 |
| 5 | 1632960 |
| 6 | 44089920 |
| 7 | 1322697600 |
| 8 | 43649020800 |
| 9 | 1571364748800 |
| 10 | 61283225203200 |
| 11 | 2573895458534400 |
| 12 | 115825295634048000 |
| 13 | 5559614190434304000 |
| 14 | 283540323712149504000 |
| 15 | 15311177480456073216000 |
| 16 | 872737116385996173312000 |
| 17 | 52364226983159770398720000 |