n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 2 |
4 | 12 |
5 | 64 |
6 | 312 |
7 | 1460 |
8 | 6624 |
9 | 29394 |
10 | 128264 |
11 | 552384 |
12 | 2353888 |
13 | 9943896 |
14 | 41703328 |
15 | 173822258 |
16 | 720671156 |
17 | 2974187392 |
18 | 12224902712 |
19 | 50069348140 |
20 | 204417445696 |
21 | 832198630882 |
22 | 3379257614032 |
23 | 13690075484800 |
24 | 55344113101440 |
[0,0,2,12,64,312,1460,6624,29394,128264,552384, 2353888,9943896,41703328,173822258,720671156, 2974187392,12224902712,50069348140,204417445696, 832198630882,3379257614032,13690075484800, 55344113101440] |