n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 1 |
7 | 3 |
8 | 27 |
9 | 171 |
10 | 1249 |
11 | 8389 |
12 | 56078 |
13 | 360430 |
14 | 2272598 |
15 | 14037552 |
16 | 85516427 |
17 | 514976658 |
18 | 3074986236 |
19 | 18239677629 |
20 | 107654218055 |
21 | 632996894925 |
22 | 3711499485032 |
23 | 21716765203045 |
24 | 126880009551584 |
[0,0,0,0,0,1,3,27,171,1249,8389,56078,360430, 2272598,14037552,85516427,514976658,3074986236, 18239677629,107654218055,632996894925, 3711499485032,21716765203045,126880009551584] |