n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 17 |
4 | 89 |
5 | 551 |
6 | 3946 |
7 | 32119 |
8 | 293017 |
9 | 2962289 |
10 | 32878196 |
11 | 397500641 |
12 | 5200386529 |
13 | 73202912047 |
14 | 1103244067234 |
15 | 17725107987791 |
16 | 302430079859681 |
17 | 5461466545462049 |
18 | 104070294443638612 |
19 | 2086867355418234289 |
20 | 43928284758226558681 |
21 | 968509132036402525271 |
[1,1,4,17,89,551,3946,32119,293017,2962289, 32878196,397500641,5200386529,73202912047, 1103244067234,17725107987791,302430079859681, 5461466545462049,104070294443638612, 2086867355418234289,43928284758226558681, 968509132036402525271] |