n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 4 |
6 | 6 |
7 | 4 |
8 | 16 |
9 | 60 |
10 | 88 |
11 | 224 |
12 | 650 |
13 | 1480 |
14 | 3372 |
15 | 9208 |
16 | 23126 |
17 | 56988 |
18 | 147778 |
19 | 387084 |
20 | 998552 |
21 | 2604672 |
22 | 6890844 |
23 | 18189156 |
24 | 48123802 |
25 | 128110692 |
26 | 341753792 |
27 | 912635960 |
28 | 2443846624 |
29 | 6557775236 |
30 | 17619900692 |
31 | 47420051376 |
[0,0,4,6,4,16,60,88,224,650,1480,3372,9208,23126, 56988,147778,387084,998552,2604672,6890844, 18189156,48123802,128110692,341753792,912635960, 2443846624,6557775236,17619900692,47420051376] |