n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 24 |
5 | 116 |
6 | 632 |
7 | 3720 |
8 | 23072 |
9 | 148528 |
10 | 983072 |
11 | 6647776 |
12 | 45727616 |
13 | 318947136 |
14 | 2250473344 |
15 | 16034726016 |
16 | 115204555264 |
17 | 833701020416 |
18 | 6071393452544 |
19 | 44460988694016 |
20 | 327199429228544 |
21 | 2418586647786496 |
22 | 17948732704159744 |
23 | 133679253739800576 |
[1,1,2,6,24,116,632,3720,23072,148528,983072, 6647776,45727616,318947136,2250473344,16034726016, 115204555264,833701020416,6071393452544, 44460988694016,327199429228544,2418586647786496, 17948732704159744,133679253739800576] |