n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 8 |
4 | 28 |
5 | 120 |
6 | 460 |
7 | 1848 |
8 | 7308 |
9 | 29240 |
10 | 116620 |
11 | 466488 |
12 | 1864588 |
13 | 7458360 |
14 | 29827980 |
15 | 119311928 |
16 | 477225868 |
17 | 1908903480 |
18 | 7635526540 |
19 | 30542106168 |
20 | 122168075148 |
21 | 488672300600 |
22 | 1954687804300 |
[0,0,0,8,28,120,460,1848,7308,29240,116620,466488, 1864588,7458360,29827980,119311928,477225868, 1908903480,7635526540,30542106168,122168075148, 488672300600,1954687804300] |