n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 6 |
3 | 20 |
4 | 81 |
5 | 324 |
6 | 1296 |
7 | 5184 |
8 | 20736 |
9 | 82944 |
10 | 331776 |
11 | 1327104 |
12 | 5308416 |
13 | 21233664 |
14 | 84934656 |
15 | 339738624 |
16 | 1358954496 |
17 | 5435817984 |
18 | 21743271936 |
19 | 86973087744 |
20 | 347892350976 |
21 | 1391569403904 |
22 | 5566277615616 |
23 | 22265110462464 |
24 | 89060441849856 |
[1,0,6,20,81,324,1296,5184,20736,82944,331776, 1327104,5308416,21233664,84934656,339738624, 1358954496,5435817984,21743271936,86973087744, 347892350976,1391569403904,5566277615616, 22265110462464,89060441849856] |