n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 9 |
3 | 58 |
4 | 325 |
5 | 1686 |
6 | 8330 |
7 | 39796 |
8 | 185517 |
9 | 848830 |
10 | 3827230 |
11 | 17053356 |
12 | 75249954 |
13 | 329353948 |
14 | 1431575220 |
15 | 6185613032 |
16 | 26589395581 |
17 | 113780713806 |
18 | 484945025942 |
19 | 2059546425340 |
20 | 8719018250838 |
21 | 36805967321684 |
[0,1,9,58,325,1686,8330,39796,185517,848830, 3827230,17053356,75249954,329353948,1431575220, 6185613032,26589395581,113780713806,484945025942, 2059546425340,8719018250838,36805967321684] |