n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 6 |
6 | 7 |
7 | 25 |
8 | 80 |
9 | 255 |
10 | 795 |
11 | 2919 |
12 | 10378 |
13 | 36590 |
14 | 130716 |
15 | 480773 |
16 | 1774714 |
17 | 6543633 |
18 | 24208803 |
19 | 90331307 |
20 | 339178346 |
21 | 1277308160 |
22 | 4819109576 |
[1,0,1,1,6,7,25,80,255,795,2919,10378,36590, 130716,480773,1774714,6543633,24208803,90331307, 339178346,1277308160,4819109576] |