n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 18 |
4 | 94 |
5 | 1134 |
6 | 12521 |
7 | 311014 |
8 | 12726939 |
9 | 841464188 |
10 | 99227326734 |
11 | 19635419823116 |
12 | 6617813957084794 |
13 | 3801727775370243509 |
[1,4,18,94,1134,12521,311014,12726939,841464188, 99227326734,19635419823116,6617813957084794, 3801727775370243509] |