n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 12 |
4 | 24 |
5 | 60 |
6 | 180 |
7 | 588 |
8 | 1968 |
9 | 6840 |
10 | 24240 |
11 | 87252 |
12 | 318360 |
13 | 1173744 |
14 | 4366740 |
15 | 16370700 |
16 | 61780320 |
17 | 234505140 |
18 | 894692736 |
19 | 3429028116 |
20 | 13195862760 |
21 | 50968206912 |
22 | 197517813636 |
23 | 767766750564 |
24 | 2992650987408 |
25 | 11694675166500 |
26 | 45807740881032 |
[1,0,0,12,24,60,180,588,1968,6840,24240,87252, 318360,1173744,4366740,16370700,61780320, 234505140,894692736,3429028116,13195862760, 50968206912,197517813636,767766750564, 2992650987408,11694675166500,45807740881032] |