n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 8 |
5 | 41 |
6 | 120 |
7 | 826 |
8 | 4602 |
9 | 47570 |
10 | 473649 |
11 | 10093040 |
12 | 203861263 |
13 | 8821354950 |
14 | 467680021214 |
15 | 51343335981422 |
16 | 7427745026671872 |
17 | 2637938775610253117 |
18 | 1315874983271581469522 |
19 | 1773440184382265096424766 |
20 | 4023316751814245493054773044 |
21 | 26037772294065481552999203782248 |
[0,1,1,4,8,41,120,826,4602,47570,473649,10093040, 203861263,8821354950,467680021214,51343335981422, 7427745026671872,2637938775610253117, 1315874983271581469522,1773440184382265096424766, 4023316751814245493054773044, 26037772294065481552999203782248] |