n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 0 |
5 | 6 |
6 | 8 |
7 | 30 |
8 | 121 |
9 | 385 |
10 | 1102 |
11 | 4207 |
12 | 13263 |
13 | 48904 |
14 | 164298 |
15 | 610450 |
16 | 2108897 |
17 | 7592564 |
18 | 27444148 |
19 | 100851443 |
20 | 365507140 |
21 | 1344593522 |
22 | 4960584613 |
23 | 18435632285 |
24 | 68320148701 |
25 | 254166868115 |
26 | 951593812462 |
27 | 3568369245595 |
28 | 13386056545363 |
29 | 50416752718382 |
[0,0,1,0,6,8,30,121,385,1102,4207,13263,48904, 164298,610450,2108897,7592564,27444148,100851443, 365507140,1344593522,4960584613,18435632285, 68320148701,254166868115,951593812462, 3568369245595,13386056545363,50416752718382] |