n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 31 |
4 | 156 |
5 | 784 |
6 | 3962 |
7 | 20173 |
8 | 103522 |
9 | 535294 |
10 | 2787700 |
11 | 14613710 |
12 | 77072816 |
13 | 408737760 |
14 | 2178631156 |
15 | 11666175215 |
16 | 62734622764 |
17 | 338660977020 |
18 | 1834690352066 |
19 | 9971834477972 |
20 | 54361287536706 |
21 | 297170702049966 |
22 | 1628670524735842 |
[1,6,31,156,784,3962,20173,103522,535294,2787700, 14613710,77072816,408737760,2178631156, 11666175215,62734622764,338660977020, 1834690352066,9971834477972,54361287536706, 297170702049966,1628670524735842] |