n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 3 |
3 | 2 |
4 | 12 |
5 | 24 |
6 | 80 |
7 | 222 |
8 | 687 |
9 | 2096 |
10 | 6585 |
11 | 20892 |
12 | 67216 |
13 | 218412 |
14 | 716304 |
15 | 2367696 |
16 | 7881381 |
17 | 26398728 |
18 | 88918451 |
19 | 301014786 |
20 | 1023681792 |
21 | 3495786472 |
22 | 11983194420 |
23 | 41220422022 |
24 | 142247592803 |
25 | 492339048156 |
26 | 1708741395441 |
27 | 5945617039980 |
28 | 20737219258440 |
29 | 72488490389592 |
[1,0,3,2,12,24,80,222,687,2096,6585,20892,67216, 218412,716304,2367696,7881381,26398728,88918451, 301014786,1023681792,3495786472,11983194420, 41220422022,142247592803,492339048156, 1708741395441,5945617039980,20737219258440, 72488490389592] |