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 | 10 |
| 1 | 880 |
| 2 | 32032 |
| 3 | 732160 |
| 4 | 12446720 |
| 5 | 171991040 |
| 6 | 2037432320 |
| 7 | 21422145536 |
| 8 | 204770508800 |
| 9 | 1810602393600 |
| 10 | 15002134118400 |
| 11 | 117645194035200 |
| 12 | 879986051383296 |
| 13 | 6317848574033920 |
| 14 | 43758103916707840 |
| 15 | 293602761763717120 |