n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 9 |
4 | 33 |
5 | 321 |
6 | 1411 |
7 | 10613 |
8 | 70449 |
9 | 534153 |
10 | 3908739 |
11 | 31172293 |
12 | 247959153 |
13 | 2040991681 |
14 | 16818777105 |
15 | 139873091535 |
16 | 1164007471357 |
17 | 9753589044027 |
18 | 82147216112609 |
19 | 696523301660651 |
20 | 5930891437147689 |
21 | 50682977439086169 |
[1,1,9,33,321,1411,10613,70449,534153,3908739, 31172293,247959153,2040991681,16818777105, 139873091535,1164007471357,9753589044027, 82147216112609,696523301660651,5930891437147689, 50682977439086169] |