n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 15 |
5 | 84 |
6 | 750 |
7 | 6852 |
8 | 79639 |
9 | 1006184 |
10 | 14875218 |
11 | 241078100 |
12 | 4392257716 |
13 | 87279581232 |
14 | 1905609327583 |
15 | 45008114794874 |
16 | 1150897256534370 |
17 | 31580332783936416 |
18 | 928535967078634497 |
19 | 29090873853321687666 |
20 | 969132936087009709174 |
21 | 34198721664081728281400 |
[1,0,1,2,15,84,750,6852,79639,1006184,14875218, 241078100,4392257716,87279581232,1905609327583, 45008114794874,1150897256534370,31580332783936416, 928535967078634497,29090873853321687666, 969132936087009709174,34198721664081728281400] |