n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 1 |
6 | 12 |
7 | 60 |
8 | 200 |
9 | 150 |
10 | 700 |
11 | 2450 |
12 | 7056 |
13 | 8820 |
14 | 31752 |
15 | 97020 |
16 | 261360 |
17 | 426888 |
18 | 1359072 |
19 | 3864861 |
20 | 10020010 |
21 | 19324305 |
22 | 57257200 |
23 | 155739584 |
24 | 393853824 |
25 | 851005584 |
26 | 2405321568 |
27 | 6347376360 |
28 | 15774544800 |
29 | 37026362100 |
30 | 101219995800 |
31 | 261312846300 |
[0,0,0,1,6,1,12,60,200,150,700,2450,7056,8820, 31752,97020,261360,426888,1359072,3864861, 10020010,19324305,57257200,155739584,393853824, 851005584,2405321568,6347376360,15774544800, 37026362100,101219995800,261312846300] |