n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 12 |
4 | 28 |
5 | 140 |
6 | 956 |
7 | 3520 |
8 | 17792 |
9 | 111600 |
10 | 1144400 |
11 | 4884064 |
12 | 34907936 |
13 | 214869920 |
14 | 1881044032 |
15 | 25687617152 |
16 | 139175009920 |
17 | 1098825972608 |
18 | 8770328141888 |
19 | 74286112885504 |
20 | 784394159958848 |
21 | 15114871659653952 |
22 | 92392468773724544 |
23 | 889380453354852416 |
24 | 7652770202041529856 |
[1,1,2,12,28,140,956,3520,17792,111600,1144400, 4884064,34907936,214869920,1881044032,25687617152, 139175009920,1098825972608,8770328141888, 74286112885504,784394159958848,15114871659653952, 92392468773724544,889380453354852416, 7652770202041529856] |