n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 6 |
4 | 36 |
5 | 150 |
6 | 900 |
7 | 9366 |
8 | 101556 |
9 | 1031190 |
10 | 10995300 |
11 | 134640726 |
12 | 1844184276 |
13 | 26656678230 |
14 | 400614423300 |
15 | 6347263038486 |
16 | 106960986110196 |
17 | 1905688502565270 |
18 | 35546025523227300 |
19 | 691014283378745046 |
20 | 13999772792477879316 |
21 | 295570215436360196310 |
[1,0,0,6,36,150,900,9366,101556,1031190,10995300, 134640726,1844184276,26656678230,400614423300, 6347263038486,106960986110196,1905688502565270, 35546025523227300,691014283378745046, 13999772792477879316,295570215436360196310] |