n | a(n) |
---|---|
1 | 3 |
2 | 10 |
3 | 56 |
4 | 120 |
5 | 432 |
6 | 12672 |
7 | 249600 |
8 | 873180 |
9 | 4838400 |
10 | 296110080 |
11 | 10786406400 |
12 | 49621572000 |
13 | 355053404160 |
14 | 34613526528000 |
15 | 211189410432000 |
16 | 1910897049600000 |
17 | 21311651380219200 |
18 | 274774815041126400 |
19 | 62908970812047360000 |
[3,10,56,120,432,12672,249600,873180,4838400, 296110080,10786406400,49621572000,355053404160, 34613526528000,211189410432000,1910897049600000, 21311651380219200,274774815041126400, 62908970812047360000] |