n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 9 |
4 | 36 |
5 | 101 |
6 | 261 |
7 | 882 |
8 | 3921 |
9 | 17253 |
10 | 67554 |
11 | 243695 |
12 | 876789 |
13 | 3324906 |
14 | 13166791 |
15 | 52301709 |
16 | 203824548 |
17 | 782913717 |
18 | 3010327497 |
19 | 11695756698 |
20 | 45823049817 |
21 | 179787741723 |
22 | 703527078258 |
23 | 2747647985241 |
24 | 10739885115573 |
25 | 42082084255050 |
26 | 165225573240651 |
[0,0,1,9,36,101,261,882,3921,17253,67554,243695, 876789,3324906,13166791,52301709,203824548, 782913717,3010327497,11695756698,45823049817, 179787741723,703527078258,2747647985241, 10739885115573,42082084255050,165225573240651] |