n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 8 |
5 | 25 |
6 | 75 |
7 | 245 |
8 | 800 |
9 | 2700 |
10 | 9225 |
11 | 32065 |
12 | 112632 |
13 | 400023 |
14 | 1432613 |
15 | 5170575 |
16 | 18783360 |
17 | 68635477 |
18 | 252085716 |
19 | 930138521 |
20 | 3446158600 |
21 | 12815663595 |
22 | 47820414961 |
23 | 178987624513 |
24 | 671825020128 |
25 | 2528212128750 |
26 | 9536894664375 |
27 | 36054433807398 |
28 | 136583760011496 |
[1,1,1,3,8,25,75,245,800,2700,9225,32065,112632, 400023,1432613,5170575,18783360,68635477, 252085716,930138521,3446158600,12815663595, 47820414961,178987624513,671825020128, 2528212128750,9536894664375,36054433807398, 136583760011496] |