n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 3 |
4 | 6 |
5 | 60 |
6 | 390 |
7 | 3255 |
8 | 29652 |
9 | 300384 |
10 | 3337380 |
11 | 40382595 |
12 | 528644490 |
13 | 7445077068 |
14 | 112248853626 |
15 | 1803999434055 |
16 | 30788257006920 |
17 | 556112892188640 |
18 | 10598857474652712 |
19 | 212565974908314339 |
20 | 4475073155964510510 |
[0,0,3,6,60,390,3255,29652,300384,3337380, 40382595,528644490,7445077068,112248853626, 1803999434055,30788257006920,556112892188640, 10598857474652712,212565974908314339, 4475073155964510510] |