n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 9 |
4 | 66 |
5 | 345 |
6 | 1590 |
7 | 6909 |
8 | 29106 |
9 | 120465 |
10 | 493230 |
11 | 2005509 |
12 | 8116746 |
13 | 32744985 |
14 | 131801670 |
15 | 529647309 |
16 | 2125861986 |
17 | 8525167905 |
18 | 34165634910 |
19 | 136857036309 |
20 | 548010848826 |
21 | 2193789933225 |
22 | 8780396200950 |
23 | 35137287916509 |
[0,0,9,66,345,1590,6909,29106,120465,493230, 2005509,8116746,32744985,131801670,529647309, 2125861986,8525167905,34165634910,136857036309, 548010848826,2193789933225,8780396200950, 35137287916509] |