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 | 20736 |
| 1 | 1 |
| 2 | 12 |
| 3 | 20736 |
| 4 | 144 |
| 5 | 2985984 |
| 6 | 20736 |
| 7 | 1728 |
| 8 | 1728 |
| 9 | 2985984 |
| 10 | 8916100448256 |
| 11 | 2218611106740436992 |
| 12 | 12 |
| 13 | 79496847203390844133441536 |
| 14 | 144 |
| 15 | 5159780352 |
| 16 | 429981696 |
| 17 | 1728 |
| 18 | 35831808 |
| 19 | 61917364224 |
| 20 | 20736 |
| 21 | 15407021574586368 |