n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 21 |
3 | 146 |
4 | 981 |
5 | 6222 |
6 | 38921 |
7 | 239946 |
8 | 1469826 |
9 | 8957976 |
10 | 54420339 |
11 | 329815506 |
12 | 1995387801 |
13 | 12056025246 |
14 | 72766743801 |
15 | 438839319470 |
16 | 2644790643216 |
17 | 15930973595046 |
18 | 95917737415956 |
19 | 577288174746786 |
20 | 3473350521083199 |
21 | 20892333943230346 |
22 | 125638899138654861 |
[1,6,21,146,981,6222,38921,239946,1469826,8957976, 54420339,329815506,1995387801,12056025246, 72766743801,438839319470,2644790643216, 15930973595046,95917737415956,577288174746786, 3473350521083199,20892333943230346, 125638899138654861] |