n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 18 |
6 | 96 |
7 | 260 |
8 | 1851 |
9 | 5270 |
10 | 46515 |
11 | 137942 |
12 | 1447202 |
13 | 4433772 |
14 | 53787706 |
15 | 169169912 |
16 | 2326986783 |
17 | 7477418982 |
18 | 114916173009 |
19 | 375898894514 |
20 | 6380455164161 |
21 | 21185872231238 |
22 | 393499602818322 |
23 | 1323362744628080 |
24 | 26691270481453228 |
25 | 90755667374332324 |
[1,0,1,2,7,18,96,260,1851,5270,46515,137942, 1447202,4433772,53787706,169169912,2326986783, 7477418982,114916173009,375898894514, 6380455164161,21185872231238,393499602818322, 1323362744628080,26691270481453228, 90755667374332324] |