n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 28 |
4 | 150 |
5 | 858 |
6 | 5096 |
7 | 31008 |
8 | 191862 |
9 | 1201750 |
10 | 7597590 |
11 | 48384180 |
12 | 309939240 |
13 | 1994981688 |
14 | 12892738800 |
15 | 83604224384 |
16 | 543722433078 |
17 | 3545056580814 |
18 | 23164787710610 |
19 | 151662849838500 |
20 | 994674967479270 |
21 | 6533629880128890 |
[1,6,28,150,858,5096,31008,191862,1201750,7597590, 48384180,309939240,1994981688,12892738800, 83604224384,543722433078,3545056580814, 23164787710610,151662849838500,994674967479270, 6533629880128890] |