n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 10 |
6 | 30 |
7 | 175 |
8 | 1176 |
9 | 7084 |
10 | 42120 |
11 | 286605 |
12 | 2270180 |
13 | 19213766 |
14 | 166326524 |
15 | 1497096055 |
16 | 14374680880 |
17 | 147259920760 |
18 | 1582837679056 |
19 | 17659771122969 |
20 | 204674606377140 |
21 | 2473357218561250 |
22 | 31148510170120420 |
23 | 407154732691440811 |
24 | 5504706823227724904 |
[1,0,0,1,4,10,30,175,1176,7084,42120,286605, 2270180,19213766,166326524,1497096055,14374680880, 147259920760,1582837679056,17659771122969, 204674606377140,2473357218561250, 31148510170120420,407154732691440811, 5504706823227724904] |