n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 2 |
6 | 20 |
7 | 144 |
8 | 1265 |
9 | 12072 |
10 | 126565 |
11 | 1445100 |
12 | 17875140 |
13 | 238282730 |
14 | 3407118041 |
15 | 52034548064 |
16 | 845569542593 |
17 | 14570246018686 |
18 | 265397214435860 |
19 | 5095853023109484 |
20 | 102877234050493609 |
21 | 2178674876680100744 |
22 | 48296053720501168037 |
23 | 1118480911876659396600 |
[0,0,0,1,2,20,144,1265,12072,126565,1445100, 17875140,238282730,3407118041,52034548064, 845569542593,14570246018686,265397214435860, 5095853023109484,102877234050493609, 2178674876680100744,48296053720501168037, 1118480911876659396600] |