n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 8 |
4 | 42 |
5 | 260 |
6 | 1860 |
7 | 15020 |
8 | 134336 |
9 | 1313696 |
10 | 13911528 |
11 | 158279872 |
12 | 1922455440 |
13 | 24794405328 |
14 | 338037825952 |
15 | 4853075024192 |
16 | 73123573392416 |
17 | 1152965052858560 |
18 | 18974557508679104 |
19 | 325181733420301504 |
20 | 5791431588096653824 |
21 | 106990656473333558528 |
22 | 2046805540661737323136 |
[1,1,2,8,42,260,1860,15020,134336,1313696, 13911528,158279872,1922455440,24794405328, 338037825952,4853075024192,73123573392416, 1152965052858560,18974557508679104, 325181733420301504,5791431588096653824, 106990656473333558528,2046805540661737323136] |