n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 15 |
4 | 56 |
5 | 210 |
6 | 792 |
7 | 3003 |
8 | 11440 |
9 | 43758 |
10 | 167960 |
11 | 646646 |
12 | 2496144 |
13 | 9657700 |
14 | 37442160 |
15 | 145422675 |
16 | 565722720 |
17 | 2203961430 |
18 | 8597496600 |
19 | 33578000610 |
20 | 131282408400 |
21 | 513791607420 |
22 | 2012616400080 |
23 | 7890371113950 |
24 | 30957699535776 |
25 | 121548660036300 |
26 | 477551179875952 |
[0,1,4,15,56,210,792,3003,11440,43758,167960, 646646,2496144,9657700,37442160,145422675, 565722720,2203961430,8597496600,33578000610, 131282408400,513791607420,2012616400080, 7890371113950,30957699535776,121548660036300, 477551179875952] |