n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 3 |
3 | 0 |
4 | 15 |
5 | 12 |
6 | 99 |
7 | 168 |
8 | 759 |
9 | 1764 |
10 | 6315 |
11 | 16896 |
12 | 54783 |
13 | 156156 |
14 | 484851 |
15 | 1421784 |
16 | 4330887 |
17 | 12861588 |
18 | 38846907 |
19 | 116016432 |
20 | 349097871 |
21 | 1045196460 |
22 | 3139783683 |
23 | 9410962440 |
24 | 28249664535 |
25 | 84715439172 |
26 | 254213426379 |
27 | 762506061408 |
[1,0,3,0,15,12,99,168,759,1764,6315,16896,54783, 156156,484851,1421784,4330887,12861588,38846907, 116016432,349097871,1045196460,3139783683, 9410962440,28249664535,84715439172,254213426379, 762506061408] |