n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 4 |
6 | 6 |
7 | 4 |
8 | 14 |
9 | 56 |
10 | 94 |
11 | 204 |
12 | 638 |
13 | 1508 |
14 | 3414 |
15 | 9176 |
16 | 23232 |
17 | 57600 |
18 | 148550 |
19 | 388584 |
20 | 1001432 |
21 | 2614820 |
22 | 6905866 |
23 | 18222128 |
24 | 48202028 |
25 | 128305452 |
26 | 342215994 |
27 | 913945432 |
28 | 2447695760 |
29 | 6569189860 |
30 | 17654039564 |
31 | 47523604660 |
[0,0,4,6,4,14,56,94,204,638,1508,3414,9176,23232, 57600,148550,388584,1001432,2614820,6905866, 18222128,48202028,128305452,342215994,913945432, 2447695760,6569189860,17654039564,47523604660] |