n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 13 |
4 | 42 |
5 | 137 |
6 | 448 |
7 | 1465 |
8 | 4790 |
9 | 15661 |
10 | 51204 |
11 | 167413 |
12 | 547362 |
13 | 1789617 |
14 | 5851208 |
15 | 19130705 |
16 | 62548430 |
17 | 204504021 |
18 | 668632204 |
19 | 2186113613 |
20 | 7147565882 |
21 | 23369187097 |
22 | 76406277968 |
23 | 249812682345 |
24 | 816770269670 |
25 | 2670455587581 |
[0,1,4,13,42,137,448,1465,4790,15661,51204,167413, 547362,1789617,5851208,19130705,62548430, 204504021,668632204,2186113613,7147565882, 23369187097,76406277968,249812682345,816770269670, 2670455587581] |