n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 19 |
5 | 71 |
6 | 601 |
7 | 3277 |
8 | 39089 |
9 | 277489 |
10 | 4250341 |
11 | 37110701 |
12 | 693581197 |
13 | 7184750509 |
14 | 158461520309 |
15 | 1899055549861 |
16 | 48269252293201 |
17 | 656869268651537 |
18 | 18903165795857089 |
19 | 287927838327392929 |
20 | 9252988524143245181 |
21 | 155954097639111859501 |
[1,1,2,4,19,71,601,3277,39089,277489,4250341, 37110701,693581197,7184750509,158461520309, 1899055549861,48269252293201,656869268651537, 18903165795857089,287927838327392929, 9252988524143245181,155954097639111859501] |