n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 69 |
3 | 502 |
4 | 3564 |
5 | 24960 |
6 | 173325 |
7 | 1196748 |
8 | 8229849 |
9 | 56427177 |
10 | 386011116 |
11 | 2635972920 |
12 | 17974898872 |
13 | 122430895956 |
14 | 833108684637 |
15 | 5664553564440 |
16 | 38488954887171 |
17 | 261369752763963 |
18 | 1774016418598269 |
19 | 12035694958994142 |
20 | 81624256468292016 |
21 | 553377268856455968 |
[1,9,69,502,3564,24960,173325,1196748,8229849, 56427177,386011116,2635972920,17974898872, 122430895956,833108684637,5664553564440, 38488954887171,261369752763963,1774016418598269, 12035694958994142,81624256468292016, 553377268856455968] |