n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 9 |
5 | 51 |
6 | 233 |
7 | 939 |
8 | 3489 |
9 | 12259 |
10 | 41385 |
11 | 135675 |
12 | 435185 |
13 | 1373139 |
14 | 4279161 |
15 | 13210219 |
16 | 40490817 |
17 | 123438531 |
18 | 374772041 |
19 | 1134343131 |
20 | 3425442705 |
21 | 10326135475 |
22 | 31088506905 |
23 | 93507741771 |
24 | 281053804769 |
25 | 844319042211 |
26 | 2535473709033 |
27 | 7611873722299 |
28 | 22847398772529 |
29 | 68567563468179 |
[0,0,0,1,9,51,233,939,3489,12259,41385,135675, 435185,1373139,4279161,13210219,40490817, 123438531,374772041,1134343131,3425442705, 10326135475,31088506905,93507741771,281053804769, 844319042211,2535473709033,7611873722299, 22847398772529,68567563468179] |