n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 14 |
5 | 68 |
6 | 389 |
7 | 2593 |
8 | 19884 |
9 | 172328 |
10 | 1665837 |
11 | 17768938 |
12 | 207304278 |
13 | 2625854188 |
14 | 35886673906 |
15 | 526337883959 |
16 | 8245960182038 |
17 | 137432669700633 |
18 | 2427977164711192 |
19 | 45322240407942257 |
20 | 891337394689531069 |
[1,0,1,4,14,68,389,2593,19884,172328,1665837, 17768938,207304278,2625854188,35886673906, 526337883959,8245960182038,137432669700633, 2427977164711192,45322240407942257, 891337394689531069] |