n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 20 |
6 | 71 |
7 | 259 |
8 | 961 |
9 | 3606 |
10 | 13640 |
11 | 51909 |
12 | 198497 |
13 | 762007 |
14 | 2934764 |
15 | 11333950 |
16 | 43874857 |
17 | 170193528 |
18 | 661386105 |
19 | 2574320659 |
20 | 10034398370 |
21 | 39163212165 |
22 | 153027659730 |
23 | 598577118991 |
24 | 2343628878849 |
25 | 9184197395425 |
26 | 36020235035016 |
27 | 141376666307608 |
[1,1,2,6,20,71,259,961,3606,13640,51909,198497, 762007,2934764,11333950,43874857,170193528, 661386105,2574320659,10034398370,39163212165, 153027659730,598577118991,2343628878849, 9184197395425,36020235035016,141376666307608] |