n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 15 |
5 | 222 |
6 | 3670 |
7 | 68820 |
8 | 1456875 |
9 | 34506640 |
10 | 906073524 |
11 | 26154657270 |
12 | 823808845585 |
13 | 28129686128940 |
14 | 1035350305641990 |
15 | 40871383866109888 |
16 | 1722832666898627865 |
17 | 77242791668604946560 |
18 | 3670690919234354407000 |
19 | 184312149879830557190940 |
20 | 9751080154504005703189791 |
[1,0,0,1,15,222,3670,68820,1456875,34506640, 906073524,26154657270,823808845585,28129686128940, 1035350305641990,40871383866109888, 1722832666898627865,77242791668604946560, 3670690919234354407000,184312149879830557190940, 9751080154504005703189791] |