n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 24 |
4 | 296 |
5 | 4280 |
6 | 79032 |
7 | 1978368 |
8 | 57803776 |
9 | 1949421888 |
10 | 78945675200 |
11 | 3678493774560 |
12 | 190462000632576 |
13 | 11112878148649472 |
14 | 730288018660087552 |
15 | 52727783838765181440 |
16 | 4148774572438335014912 |
17 | 358041540338404096024576 |
18 | 33700760914469383117799424 |
[1,1,4,24,296,4280,79032,1978368,57803776, 1949421888,78945675200,3678493774560, 190462000632576,11112878148649472, 730288018660087552,52727783838765181440, 4148774572438335014912,358041540338404096024576, 33700760914469383117799424] |