n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 18 |
4 | 64 |
5 | 250 |
6 | 900 |
7 | 3430 |
8 | 12800 |
9 | 48600 |
10 | 184500 |
11 | 705430 |
12 | 2703168 |
13 | 10400598 |
14 | 40113164 |
15 | 155117250 |
16 | 601067520 |
17 | 2333606218 |
18 | 9075085776 |
19 | 35345263798 |
20 | 137846344000 |
21 | 538257870990 |
22 | 2104098258284 |
23 | 8233430727598 |
24 | 32247600966144 |
[1,2,4,18,64,250,900,3430,12800,48600,184500, 705430,2703168,10400598,40113164,155117250, 601067520,2333606218,9075085776,35345263798, 137846344000,538257870990,2104098258284, 8233430727598,32247600966144] |