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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 72 |
| 5 | 375 |
| 6 | 1320 |
| 7 | 3675 |
| 8 | 8736 |
| 9 | 18522 |
| 10 | 36000 |
| 11 | 65340 |
| 12 | 112200 |
| 13 | 184041 |
| 14 | 290472 |
| 15 | 443625 |
| 16 | 658560 |
| 17 | 953700 |
| 18 | 1351296 |
| 19 | 1877922 |
| 20 | 2565000 |
| 21 | 3449355 |
| 22 | 4573800 |
| 23 | 5987751 |
| 24 | 7747872 |
| 25 | 9918750 |
| 26 | 12573600 |
| 27 | 15795000 |
| 28 | 19675656 |
| 29 | 24319197 |
| 30 | 29841000 |
| 31 | 36369045 |
| 32 | 44044800 |
| 33 | 53024136 |