n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 2 |
6 | 8 |
7 | 6 |
8 | 16 |
9 | 58 |
10 | 120 |
11 | 250 |
12 | 672 |
13 | 1616 |
14 | 3754 |
15 | 9534 |
16 | 23898 |
17 | 59600 |
18 | 151961 |
19 | 393164 |
20 | 1015022 |
21 | 2648698 |
22 | 6968726 |
23 | 18376842 |
24 | 48656345 |
25 | 129493884 |
26 | 345291813 |
27 | 922507740 |
28 | 2471468426 |
29 | 6633836472 |
30 | 17830265435 |
31 | 48005356190 |
[0,0,2,8,6,16,58,120,250,672,1616,3754,9534,23898, 59600,151961,393164,1015022,2648698,6968726, 18376842,48656345,129493884,345291813,922507740, 2471468426,6633836472,17830265435,48005356190] |