n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 15 |
4 | 55 |
5 | 183 |
6 | 588 |
7 | 1865 |
8 | 5887 |
9 | 18550 |
10 | 58414 |
11 | 183904 |
12 | 578936 |
13 | 1822459 |
14 | 5736946 |
15 | 18059358 |
16 | 56849069 |
17 | 178955165 |
18 | 563332829 |
19 | 1773314909 |
20 | 5582216334 |
21 | 17572253459 |
22 | 55315679765 |
23 | 174128175040 |
24 | 548137914348 |
25 | 1725482812062 |
[0,3,15,55,183,588,1865,5887,18550,58414,183904, 578936,1822459,5736946,18059358,56849069, 178955165,563332829,1773314909,5582216334, 17572253459,55315679765,174128175040,548137914348, 1725482812062] |