n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 24 |
3 | 168 |
4 | 1155 |
5 | 7920 |
6 | 54288 |
7 | 372099 |
8 | 2550408 |
9 | 17480760 |
10 | 119814915 |
11 | 821223648 |
12 | 5628750624 |
13 | 38580030723 |
14 | 264431464440 |
15 | 1812440220360 |
16 | 12422650078083 |
17 | 85146110326224 |
18 | 583600122205488 |
19 | 4000054745112195 |
20 | 27416783093579880 |
21 | 187917426909946968 |
[0,3,24,168,1155,7920,54288,372099,2550408, 17480760,119814915,821223648,5628750624, 38580030723,264431464440,1812440220360, 12422650078083,85146110326224,583600122205488, 4000054745112195,27416783093579880, 187917426909946968] |