n | a(n) |
---|---|
2 | 0 |
3 | 1 |
4 | 0 |
5 | 0 |
6 | 1 |
7 | 1 |
8 | 5 |
9 | 13 |
10 | 46 |
11 | 155 |
12 | 561 |
13 | 2068 |
14 | 7871 |
15 | 30586 |
16 | 121391 |
17 | 490196 |
18 | 2011422 |
19 | 8370698 |
20 | 35285987 |
21 | 150485667 |
22 | 648653910 |
23 | 2823402675 |
24 | 12400659846 |
25 | 54920758496 |
26 | 245126368841 |
27 | 1101983749921 |
28 | 4987538210079 |
29 | 22716326086134 |
[0,1,0,0,1,1,5,13,46,155,561,2068,7871,30586, 121391,490196,2011422,8370698,35285987,150485667, 648653910,2823402675,12400659846,54920758496, 245126368841,1101983749921,4987538210079, 22716326086134] |