n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 144 |
4 | 684 |
5 | 3240 |
6 | 15336 |
7 | 72576 |
8 | 343440 |
9 | 1625184 |
10 | 7690464 |
11 | 36391680 |
12 | 172207296 |
13 | 814893696 |
14 | 3856118400 |
15 | 18247348224 |
16 | 86347378944 |
17 | 408600184320 |
18 | 1933516832256 |
19 | 9149499887616 |
20 | 43295898332160 |
21 | 204878390667264 |
22 | 969494954010624 |
23 | 4587699380060160 |
[1,6,30,144,684,3240,15336,72576,343440,1625184, 7690464,36391680,172207296,814893696,3856118400, 18247348224,86347378944,408600184320, 1933516832256,9149499887616,43295898332160, 204878390667264,969494954010624,4587699380060160] |