n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | 9 |
5 | 20 |
6 | 50 |
7 | 119 |
8 | 289 |
9 | 696 |
10 | 1682 |
11 | 4059 |
12 | 9801 |
13 | 23660 |
14 | 57122 |
15 | 137903 |
16 | 332929 |
17 | 803760 |
18 | 1940450 |
19 | 4684659 |
20 | 11309769 |
21 | 27304196 |
22 | 65918162 |
23 | 159140519 |
24 | 384199201 |
25 | 927538920 |
26 | 2239277042 |
27 | 5406093003 |
28 | 13051463049 |
29 | 31509019100 |
30 | 76069501250 |
[1,0,2,3,9,20,50,119,289,696,1682,4059,9801,23660, 57122,137903,332929,803760,1940450,4684659, 11309769,27304196,65918162,159140519,384199201, 927538920,2239277042,5406093003,13051463049, 31509019100,76069501250] |