n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 0 |
4 | 8 |
5 | 30 |
6 | 144 |
7 | 1120 |
8 | 9120 |
9 | 80892 |
10 | 808640 |
11 | 8908416 |
12 | 106889760 |
13 | 1389405160 |
14 | 19452003648 |
15 | 291782125440 |
16 | 4668506495744 |
17 | 79364583206160 |
18 | 1428562661736960 |
19 | 27142690917071872 |
20 | 542853814698737280 |
21 | 11399930105272855776 |
22 | 250798462399704792320 |
[1,0,0,8,30,144,1120,9120,80892,808640,8908416, 106889760,1389405160,19452003648,291782125440, 4668506495744,79364583206160,1428562661736960, 27142690917071872,542853814698737280, 11399930105272855776,250798462399704792320] |