n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 5 |
3 | 15 |
4 | 55 |
5 | 215 |
6 | 881 |
7 | 3499 |
8 | 14705 |
9 | 62815 |
10 | 267691 |
11 | 1152031 |
12 | 5054975 |
13 | 22215495 |
14 | 97820089 |
15 | 435083549 |
16 | 1946783755 |
17 | 8714538577 |
18 | 39182038837 |
19 | 177168174583 |
20 | 802527055581 |
21 | 3641247264783 |
22 | 16585238682009 |
23 | 75740989879295 |
24 | 346271384506611 |
25 | 1586505453816213 |
26 | 7287225822759371 |
27 | 33516216036717503 |
[1,1,5,15,55,215,881,3499,14705,62815,267691, 1152031,5054975,22215495,97820089,435083549, 1946783755,8714538577,39182038837,177168174583, 802527055581,3641247264783,16585238682009, 75740989879295,346271384506611,1586505453816213, 7287225822759371,33516216036717503] |