n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 8 |
4 | 20 |
5 | 112 |
6 | 432 |
7 | 3200 |
8 | 16704 |
9 | 154688 |
10 | 1017920 |
11 | 11333888 |
12 | 90011264 |
13 | 1172330496 |
14 | 10908526592 |
15 | 162802835456 |
16 | 1737036006400 |
17 | 29235365490688 |
18 | 351847501606912 |
19 | 6593866787569664 |
20 | 88364197074231296 |
21 | 1825016315965767680 |
[1,2,2,8,20,112,432,3200,16704,154688,1017920, 11333888,90011264,1172330496,10908526592, 162802835456,1737036006400,29235365490688, 351847501606912,6593866787569664, 88364197074231296,1825016315965767680] |