n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 2 |
6 | 8 |
7 | 6 |
8 | 16 |
9 | 58 |
10 | 120 |
11 | 252 |
12 | 670 |
13 | 1618 |
14 | 3754 |
15 | 9522 |
16 | 23886 |
17 | 59622 |
18 | 151875 |
19 | 392938 |
20 | 1014709 |
21 | 2648440 |
22 | 6966849 |
23 | 18374138 |
24 | 48654893 |
25 | 129490838 |
26 | 345287097 |
27 | 922517576 |
28 | 2471493256 |
29 | 6633768512 |
30 | 17829837307 |
31 | 48003235776 |
[0,0,2,8,6,16,58,120,252,670,1618,3754,9522,23886, 59622,151875,392938,1014709,2648440,6966849, 18374138,48654893,129490838,345287097,922517576, 2471493256,6633768512,17829837307,48003235776] |