n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 10 |
7 | 23 |
8 | 59 |
9 | 148 |
10 | 385 |
11 | 1006 |
12 | 2678 |
13 | 7170 |
14 | 19421 |
15 | 52933 |
16 | 145364 |
17 | 401421 |
18 | 1114713 |
19 | 3109710 |
20 | 8713076 |
21 | 24506121 |
22 | 69168705 |
23 | 195849114 |
24 | 556165311 |
25 | 1583601840 |
26 | 4520226558 |
27 | 12931917204 |
28 | 37075154703 |
[1,1,1,2,4,10,23,59,148,385,1006,2678,7170,19421, 52933,145364,401421,1114713,3109710,8713076, 24506121,69168705,195849114,556165311,1583601840, 4520226558,12931917204,37075154703] |