n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 1 |
7 | 6 |
8 | 6 |
9 | 18 |
10 | 18 |
11 | 18 |
12 | 54 |
13 | 54 |
14 | 378 |
15 | 1134 |
16 | 1134 |
17 | 9072 |
18 | 81648 |
19 | 81648 |
20 | 81648 |
21 | 1714608 |
22 | 18860688 |
23 | 18860688 |
24 | 56582064 |
25 | 56582064 |
26 | 735566832 |
27 | 19860304464 |
28 | 139022131248 |
29 | 139022131248 |
30 | 417066393744 |
31 | 2085331968720 |
32 | 2085331968720 |
33 | 68815954967760 |
[0,0,1,1,1,1,6,6,18,18,18,54,54,378,1134,1134, 9072,81648,81648,81648,1714608,18860688,18860688, 56582064,56582064,735566832,19860304464, 139022131248,139022131248,417066393744, 2085331968720,2085331968720,68815954967760] |