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 | 144 |
| 3 | 1728 |
| 4 | 20736 |
| 5 | 248832 |
| 6 | 2985984 |
| 7 | 35831808 |
| 8 | 429981696 |
| 9 | 5159780352 |
| 10 | 61917364224 |
| 11 | 743008370688 |
| 12 | 0 |
| 13 | 13800864889148 |
| 14 | 36652392292352 |
| 15 | 96953703492618 |
| 16 | 236674172846080 |
| 17 | 568249606736865 |
| 18 | 15868743229440 |
| 19 | 1270692936983464 |
| 20 | 2296447475122176 |
| 21 | 1898727404471631 |
| 22 | 8621343763677184 |