n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 9 |
5 | 47 |
6 | 291 |
7 | 2084 |
8 | 16963 |
9 | 154751 |
10 | 1564473 |
11 | 17363954 |
12 | 209931921 |
13 | 2746478927 |
14 | 38660636899 |
15 | 582656032412 |
16 | 9361157155491 |
17 | 159722327675759 |
18 | 2884363055319153 |
19 | 54962620378739666 |
20 | 1102136770630112473 |
21 | 23199834803611101599 |
[1,2,9,47,291,2084,16963,154751,1564473,17363954, 209931921,2746478927,38660636899,582656032412, 9361157155491,159722327675759,2884363055319153, 54962620378739666,1102136770630112473, 23199834803611101599] |