n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 1 |
7 | 6 |
8 | 11 |
9 | 42 |
10 | 92 |
11 | 294 |
12 | 720 |
13 | 2119 |
14 | 5460 |
15 | 15477 |
16 | 40989 |
17 | 114165 |
18 | 306980 |
19 | 848268 |
20 | 2301794 |
21 | 6341450 |
22 | 17308926 |
23 | 47659837 |
24 | 130628590 |
25 | 359924353 |
26 | 989642184 |
27 | 2730224431 |
28 | 7526539869 |
29 | 20795818601 |
30 | 57457010219 |
[0,0,0,0,1,1,6,11,42,92,294,720,2119,5460,15477, 40989,114165,306980,848268,2301794,6341450, 17308926,47659837,130628590,359924353,989642184, 2730224431,7526539869,20795818601,57457010219] |