n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 3 |
5 | 6 |
6 | 14 |
7 | 30 |
8 | 77 |
9 | 196 |
10 | 525 |
11 | 1414 |
12 | 3960 |
13 | 11056 |
14 | 31636 |
15 | 90818 |
16 | 264657 |
17 | 774146 |
18 | 2289787 |
19 | 6798562 |
20 | 20354005 |
21 | 61164374 |
22 | 184985060 |
23 | 561433922 |
24 | 1712696708 |
25 | 5241637812 |
[0,1,2,3,6,14,30,77,196,525,1414,3960,11056,31636, 90818,264657,774146,2289787,6798562,20354005, 61164374,184985060,561433922,1712696708, 5241637812] |