n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 22 |
5 | 154 |
6 | 931 |
7 | 14160 |
8 | 195952 |
9 | 2808960 |
10 | 58924800 |
11 | 1585406976 |
12 | 38032879616 |
13 | 1491624640512 |
14 | 52205681184768 |
15 | 2118556421369856 |
[1,2,4,22,154,931,14160,195952,2808960,58924800, 1585406976,38032879616,1491624640512, 52205681184768,2118556421369856] |