n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 11 |
7 | 33 |
8 | 116 |
9 | 435 |
10 | 1832 |
11 | 8167 |
12 | 39700 |
13 | 201785 |
14 | 1099449 |
15 | 6237505 |
16 | 37406458 |
17 | 232176847 |
18 | 1513796040 |
19 | 10162373172 |
20 | 71158660160 |
21 | 511957012509 |
22 | 3819416719742 |
23 | 29195604706757 |
24 | 230713267586731 |
25 | 1861978821637735 |
26 | 15484368121967620 |
27 | 131388840051760458 |
[1,1,1,2,4,11,33,116,435,1832,8167,39700,201785, 1099449,6237505,37406458,232176847,1513796040, 10162373172,71158660160,511957012509, 3819416719742,29195604706757,230713267586731, 1861978821637735,15484368121967620, 131388840051760458] |