n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 150 |
4 | 726 |
5 | 3510 |
6 | 16734 |
7 | 79518 |
8 | 375246 |
9 | 1766382 |
10 | 8278638 |
11 | 38721366 |
12 | 180556206 |
13 | 840524742 |
14 | 3903866526 |
15 | 18106798830 |
16 | 83832778110 |
17 | 387690560718 |
18 | 1790330065854 |
19 | 8259528315558 |
20 | 38059497518214 |
21 | 175228328442174 |
22 | 805959153119262 |
23 | 3704270575724550 |
[1,6,30,150,726,3510,16734,79518,375246,1766382, 8278638,38721366,180556206,840524742,3903866526, 18106798830,83832778110,387690560718, 1790330065854,8259528315558,38059497518214, 175228328442174,805959153119262,3704270575724550] |