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 | 36 |
| 3 | 216 |
| 4 | 1296 |
| 5 | 7776 |
| 6 | 0 |
| 7 | 44638 |
| 8 | 106752 |
| 9 | 511758 |
| 10 | 466176 |
| 11 | 1398612 |
| 12 | 0 |
| 13 | 4175671 |
| 14 | 4282944 |
| 15 | 2765826 |
| 16 | 4259840 |
| 17 | 20220503 |
| 18 | 0 |
| 19 | 36376760 |
| 20 | 40062976 |
| 21 | 25606125 |
| 22 | 57077760 |
| 23 | 109780662 |
| 24 | 0 |
| 25 | 144545126 |
| 26 | 283401024 |
| 27 | 0 |
| 28 | 454885376 |
| 29 | 299969829 |