n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 10 |
3 | 30 |
4 | 85 |
5 | 246 |
6 | 707 |
7 | 2037 |
8 | 5864 |
9 | 16886 |
10 | 48620 |
11 | 139997 |
12 | 403104 |
13 | 1160693 |
14 | 3342081 |
15 | 9623140 |
16 | 27708726 |
17 | 79784098 |
18 | 229729153 |
19 | 661478734 |
20 | 1904652103 |
21 | 5484227157 |
22 | 15791202736 |
23 | 45468956106 |
24 | 130922641160 |
25 | 376976720745 |
26 | 1085461206128 |
27 | 3125460977225 |
[1,4,10,30,85,246,707,2037,5864,16886,48620, 139997,403104,1160693,3342081,9623140,27708726, 79784098,229729153,661478734,1904652103, 5484227157,15791202736,45468956106,130922641160, 376976720745,1085461206128,3125460977225] |