n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 0 |
4 | 12 |
5 | 50 |
6 | 405 |
7 | 3234 |
8 | 29680 |
9 | 300348 |
10 | 3337425 |
11 | 40382540 |
12 | 528644556 |
13 | 7445076990 |
14 | 112248853717 |
15 | 1803999433950 |
16 | 30788257007040 |
17 | 556112892188504 |
18 | 10598857474652865 |
19 | 212565974908314168 |
20 | 4475073155964510700 |
[0,1,0,12,50,405,3234,29680,300348,3337425, 40382540,528644556,7445076990,112248853717, 1803999433950,30788257007040,556112892188504, 10598857474652865,212565974908314168, 4475073155964510700] |