n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 2 |
5 | 12 |
6 | 72 |
7 | 272 |
8 | 968 |
9 | 5488 |
10 | 36144 |
11 | 204512 |
12 | 1135840 |
13 | 7577856 |
14 | 56287168 |
15 | 406104064 |
16 | 2933384704 |
17 | 23084016896 |
18 | 194919700480 |
19 | 1664627753984 |
20 | 14417113925632 |
21 | 131148402111488 |
22 | 1251412558922752 |
23 | 12211894620549120 |
[0,1,2,2,12,72,272,968,5488,36144,204512,1135840, 7577856,56287168,406104064,2933384704,23084016896, 194919700480,1664627753984,14417113925632, 131148402111488,1251412558922752, 12211894620549120] |