n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 26 |
4 | 254 |
5 | 3538 |
6 | 67014 |
7 | 1660866 |
8 | 52230550 |
9 | 2033261906 |
10 | 96018823814 |
11 | 5409008246626 |
12 | 358368831222006 |
13 | 27589872391918194 |
14 | 2442595357421865574 |
15 | 246430234111929035906 |
16 | 28106918525950072081622 |
17 | 3598669462582938225587602 |
18 | 513978991104098010878849094 |
[1,1,4,26,254,3538,67014,1660866,52230550, 2033261906,96018823814,5409008246626, 358368831222006,27589872391918194, 2442595357421865574,246430234111929035906, 28106918525950072081622,3598669462582938225587602, 513978991104098010878849094] |