n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 13 |
4 | 42 |
5 | 143 |
6 | 514 |
7 | 1915 |
8 | 7268 |
9 | 27805 |
10 | 106680 |
11 | 409633 |
12 | 1573086 |
13 | 6040587 |
14 | 23193782 |
15 | 89051615 |
16 | 341901032 |
17 | 1312664601 |
18 | 5039704492 |
19 | 19348873781 |
20 | 74285859698 |
21 | 285204660583 |
22 | 1094982340202 |
23 | 4203950929347 |
24 | 16140172668812 |
[0,1,4,13,42,143,514,1915,7268,27805,106680, 409633,1573086,6040587,23193782,89051615, 341901032,1312664601,5039704492,19348873781, 74285859698,285204660583,1094982340202, 4203950929347,16140172668812] |