n | a(n) |
---|---|
1 | 3 |
2 | 2 |
3 | 12 |
4 | 40 |
5 | 144 |
6 | 512 |
7 | 1824 |
8 | 6496 |
9 | 23136 |
10 | 82400 |
11 | 293472 |
12 | 1045216 |
13 | 3722592 |
14 | 13258208 |
15 | 47219808 |
16 | 168175840 |
17 | 598967136 |
18 | 2133253088 |
19 | 7597693536 |
20 | 27059586784 |
21 | 96374147424 |
22 | 343241615840 |
23 | 1222473142368 |
24 | 4353902658784 |
25 | 15506654261088 |
26 | 55227768100832 |
[3,2,12,40,144,512,1824,6496,23136,82400,293472, 1045216,3722592,13258208,47219808,168175840, 598967136,2133253088,7597693536,27059586784, 96374147424,343241615840,1222473142368, 4353902658784,15506654261088,55227768100832] |