n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 13 |
5 | 41 |
6 | 131 |
7 | 428 |
8 | 1429 |
9 | 4861 |
10 | 16795 |
11 | 58785 |
12 | 208011 |
13 | 742899 |
14 | 2674439 |
15 | 9694844 |
16 | 35357669 |
17 | 129644789 |
18 | 477638699 |
19 | 1767263189 |
20 | 6564120419 |
21 | 24466267019 |
22 | 91482563639 |
23 | 343059613649 |
24 | 1289904147323 |
25 | 4861946401451 |
26 | 18367353072151 |
[1,0,1,4,13,41,131,428,1429,4861,16795,58785, 208011,742899,2674439,9694844,35357669,129644789, 477638699,1767263189,6564120419,24466267019, 91482563639,343059613649,1289904147323, 4861946401451,18367353072151] |