n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 4 |
4 | 0 |
5 | 12 |
6 | 8 |
7 | 48 |
8 | 96 |
9 | 320 |
10 | 888 |
11 | 2748 |
12 | 8384 |
13 | 26340 |
14 | 83568 |
15 | 268864 |
16 | 873648 |
17 | 2865216 |
18 | 9470784 |
19 | 31525524 |
20 | 105594912 |
21 | 355673804 |
22 | 1204059144 |
23 | 4094727168 |
24 | 13983145888 |
25 | 47932777680 |
26 | 164881688088 |
27 | 568990371212 |
28 | 1969356192624 |
29 | 6834965581764 |
30 | 23782468159920 |
[0,0,4,0,12,8,48,96,320,888,2748,8384,26340,83568, 268864,873648,2865216,9470784,31525524,105594912, 355673804,1204059144,4094727168,13983145888, 47932777680,164881688088,568990371212, 1969356192624,6834965581764,23782468159920] |