n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 9 |
6 | 27 |
7 | 76 |
8 | 226 |
9 | 680 |
10 | 2078 |
11 | 6441 |
12 | 20153 |
13 | 63684 |
14 | 202732 |
15 | 649930 |
16 | 2095854 |
17 | 6794684 |
18 | 22131765 |
19 | 72393439 |
20 | 237703654 |
21 | 783198068 |
22 | 2588645047 |
23 | 8580674778 |
24 | 28517805357 |
25 | 95009277576 |
26 | 317242351135 |
27 | 1061500510809 |
28 | 3558683892258 |
29 | 11952025977378 |
30 | 40209157279701 |
[1,0,1,1,4,9,27,76,226,680,2078,6441,20153,63684, 202732,649930,2095854,6794684,22131765,72393439, 237703654,783198068,2588645047,8580674778, 28517805357,95009277576,317242351135, 1061500510809,3558683892258,11952025977378, 40209157279701] |