n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 21 |
6 | 52 |
7 | 134 |
8 | 361 |
9 | 1009 |
10 | 2926 |
11 | 8768 |
12 | 27121 |
13 | 86373 |
14 | 282864 |
15 | 950866 |
16 | 3277169 |
17 | 11564353 |
18 | 41739130 |
19 | 153919324 |
20 | 579411641 |
21 | 2224535125 |
22 | 8703993420 |
23 | 34681783422 |
24 | 140637608089 |
25 | 580019801201 |
26 | 2431509498406 |
27 | 10355296410712 |
[1,1,2,4,9,21,52,134,361,1009,2926,8768,27121, 86373,282864,950866,3277169,11564353,41739130, 153919324,579411641,2224535125,8703993420, 34681783422,140637608089,580019801201, 2431509498406,10355296410712] |