n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 10 |
7 | 25 |
8 | 69 |
9 | 197 |
10 | 589 |
11 | 1806 |
12 | 5685 |
13 | 18168 |
14 | 58905 |
15 | 192904 |
16 | 637294 |
17 | 2119994 |
18 | 7094961 |
19 | 23865782 |
20 | 80642017 |
21 | 273571625 |
22 | 931389949 |
23 | 3181184007 |
24 | 10897272983 |
25 | 37429033777 |
26 | 128874546753 |
27 | 444744161951 |
28 | 1538030244174 |
29 | 5329246656885 |
30 | 18499283612755 |
[1,0,1,2,4,10,25,69,197,589,1806,5685,18168,58905, 192904,637294,2119994,7094961,23865782,80642017, 273571625,931389949,3181184007,10897272983, 37429033777,128874546753,444744161951, 1538030244174,5329246656885,18499283612755] |