n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 52 |
6 | 240 |
7 | 1160 |
8 | 5795 |
9 | 29681 |
10 | 155025 |
11 | 822563 |
12 | 4421458 |
13 | 24025518 |
14 | 131759106 |
15 | 728330062 |
16 | 4053823980 |
17 | 22699853940 |
18 | 127790656040 |
19 | 722835069984 |
20 | 4106096464006 |
21 | 23414579166050 |
22 | 133984343279790 |
23 | 769124367124594 |
24 | 4427878983496972 |
25 | 25559244203741228 |
[1,1,3,12,52,240,1160,5795,29681,155025,822563, 4421458,24025518,131759106,728330062,4053823980, 22699853940,127790656040,722835069984, 4106096464006,23414579166050,133984343279790, 769124367124594,4427878983496972, 25559244203741228] |