n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 12 |
5 | 36 |
6 | 160 |
7 | 680 |
8 | 4368 |
9 | 24976 |
10 | 219616 |
11 | 1599104 |
12 | 18145600 |
13 | 160805568 |
14 | 2245960704 |
15 | 23437238656 |
16 | 389201754368 |
17 | 4669754525952 |
18 | 89893314615808 |
19 | 1218303508421632 |
20 | 26673872401980416 |
21 | 402798557886395392 |
22 | 9883555312758398976 |
[1,1,2,4,12,36,160,680,4368,24976,219616,1599104, 18145600,160805568,2245960704,23437238656, 389201754368,4669754525952,89893314615808, 1218303508421632,26673872401980416, 402798557886395392,9883555312758398976] |