n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 6 |
5 | 21 |
6 | 110 |
7 | 904 |
8 | 4312 |
9 | 74400 |
10 | 731412 |
11 | 5600761 |
12 | 128196024 |
13 | 792051157 |
14 | 18696610816 |
15 | 264267572121 |
16 | 7136433698464 |
17 | 57948743342529 |
18 | 2228312959187256 |
19 | 22463157401776612 |
20 | 681974906329502904 |
21 | 15395459281239915282 |
22 | 463374873030990445252 |
23 | 6091833036158810701465 |
[1,0,1,1,6,21,110,904,4312,74400,731412,5600761, 128196024,792051157,18696610816,264267572121, 7136433698464,57948743342529,2228312959187256, 22463157401776612,681974906329502904, 15395459281239915282,463374873030990445252, 6091833036158810701465] |