The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 12 |
| 3 | 60 |
| 4 | 120 |
| 5 | 840 |
| 6 | 4760 |
| 7 | 7582680 |
| 8 | 3026164178520 |
| 9 | 277505140475561534945640 |
| 10 | 260165888480949800316206335248860247693882960 |
| 11 | 1735545885361077128120249087863835952607412447268583818069629193850545735375261166814160 |
[3,12,60,120,840,4760,7582680,3026164178520, 277505140475561534945640, 260165888480949800316206335248860247693882960, 17355458853610771281202490878638359526074124472685\ 83818069629193850545735375261166814160] |