n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 84 |
6 | 774 |
7 | 9468 |
8 | 146052 |
9 | 2764980 |
10 | 62759736 |
11 | 1678881096 |
12 | 52185496464 |
13 | 1862666455104 |
14 | 75581146734912 |
15 | 3456542059903296 |
16 | 176834245093202736 |
17 | 10053690187338014256 |
18 | 631507398302281340736 |
19 | 43596564604477924096512 |
20 | 3292312674449093132923488 |
[1,1,1,3,12,84,774,9468,146052,2764980,62759736, 1678881096,52185496464,1862666455104, 75581146734912,3456542059903296, 176834245093202736,10053690187338014256, 631507398302281340736,43596564604477924096512, 3292312674449093132923488] |