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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 32 |
| 6 | 72 |
| 7 | 2187 |
| 8 | 20736 |
| 9 | 262144 |
| 10 | 3200000 |
| 11 | 48828125 |
| 12 | 729000000 |
| 13 | 13060694016 |
| 14 | 230539333248 |
| 15 | 4747561509943 |
| 16 | 96717311574016 |
| 17 | 2251799813685250 |
| 18 | 51998697814229000 |
| 19 | 1350851717672990000 |
| 20 | 34867844010000000000 |
| 21 | 1000000000000000000000 |
| 22 | 28531167061100000000000 |