n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 19 |
4 | 98 |
5 | 531 |
6 | 2971 |
7 | 16997 |
8 | 98830 |
9 | 581788 |
10 | 3458249 |
11 | 20718292 |
12 | 124929233 |
13 | 757421601 |
14 | 4613459330 |
15 | 28213402944 |
16 | 173141766742 |
17 | 1065820341078 |
[1,4,19,98,531,2971,16997,98830,581788,3458249, 20718292,124929233,757421601,4613459330, 28213402944,173141766742,1065820341078] |