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 | 32 |
| 2 | 560 |
| 3 | 7040 |
| 4 | 70840 |
| 5 | 604352 |
| 6 | 4528832 |
| 7 | 30529280 |
| 8 | 188313180 |
| 9 | 1076484640 |
| 10 | 5759310304 |
| 11 | 29064224896 |
| 12 | 139226153920 |
| 13 | 636391492800 |
| 14 | 2787844780160 |
| 15 | 11748015743232 |
| 16 | 47774241056710 |
| 17 | 187997792512640 |
| 18 | 717605948122000 |
| 19 | 2662641484567680 |
| 20 | 9621587501598688 |
| 21 | 33916687860860288 |