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 | 2 |
| 2 | 12 |
| 3 | 180 |
| 4 | 6300 |
| 5 | 485100 |
| 6 | 69369300 |
| 7 | 15330615300 |
| 8 | 4951788741900 |
| 9 | 2163931680210300 |
| 10 | 1443342430700270100 |
| 11 | 1297564845199542819900 |
| 12 | 1488306877443875614425300 |
| 13 | 2257761533082359307083180100 |
| 14 | 3980433582824199458387646516300 |
| 15 | 8044456270887707105401433609442300 |