n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 20 |
6 | 134 |
7 | 915 |
8 | 7324 |
9 | 65784 |
10 | 657180 |
11 | 7223637 |
12 | 86637650 |
13 | 1125842556 |
14 | 15757002706 |
15 | 236298742375 |
16 | 3780061394232 |
17 | 64251145312880 |
18 | 1156374220457784 |
19 | 21968796934412649 |
20 | 439337048505773790 |
21 | 9225384943965382564 |
22 | 202945418255342821470 |
[0,0,0,1,6,20,134,915,7324,65784,657180,7223637, 86637650,1125842556,15757002706,236298742375, 3780061394232,64251145312880,1156374220457784, 21968796934412649,439337048505773790, 9225384943965382564,202945418255342821470] |