n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 2 |
6 | 8 |
7 | 4 |
8 | 26 |
9 | 54 |
10 | 126 |
11 | 258 |
12 | 770 |
13 | 1568 |
14 | 4030 |
15 | 9560 |
16 | 25381 |
17 | 58328 |
18 | 154310 |
19 | 382514 |
20 | 1002989 |
21 | 2515622 |
22 | 6687152 |
23 | 17226920 |
24 | 45770045 |
25 | 119696108 |
26 | 320324918 |
27 | 846684628 |
28 | 2271206729 |
29 | 6053095938 |
30 | 16284572288 |
31 | 43613979158 |
[0,0,2,8,4,26,54,126,258,770,1568,4030,9560,25381, 58328,154310,382514,1002989,2515622,6687152, 17226920,45770045,119696108,320324918,846684628, 2271206729,6053095938,16284572288,43613979158] |