n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 180 |
4 | 1026 |
5 | 6156 |
6 | 35940 |
7 | 215640 |
8 | 1271106 |
9 | 7626636 |
10 | 45182124 |
11 | 271092744 |
12 | 1610875836 |
13 | 9665255016 |
14 | 57546367704 |
15 | 345278206224 |
16 | 2058613385346 |
17 | 12351680312076 |
18 | 73717606430364 |
19 | 442305638582184 |
20 | 2641804748619732 |
[1,6,30,180,1026,6156,35940,215640,1271106, 7626636,45182124,271092744,1610875836,9665255016, 57546367704,345278206224,2058613385346, 12351680312076,73717606430364,442305638582184, 2641804748619732] |