n | a(n) |
---|---|
1 | 0 |
2 | 20 |
3 | 236 |
4 | 1678 |
5 | 9714 |
6 | 51229 |
7 | 251892 |
8 | 1144205 |
9 | 4762445 |
10 | 18164685 |
11 | 63838081 |
12 | 208288721 |
13 | 635843575 |
14 | 1829104046 |
15 | 4989647446 |
16 | 12978273537 |
17 | 32338548895 |
18 | 77506161543 |
19 | 179299342255 |
20 | 401569610694 |
21 | 873025241923 |
22 | 1846627291485 |
[0,20,236,1678,9714,51229,251892,1144205,4762445, 18164685,63838081,208288721,635843575,1829104046, 4989647446,12978273537,32338548895,77506161543, 179299342255,401569610694,873025241923, 1846627291485] |