n | a(n) |
---|---|
1 | 7 |
2 | 31 |
3 | 135 |
4 | 616 |
5 | 2782 |
6 | 12544 |
7 | 56646 |
8 | 255699 |
9 | 1154239 |
10 | 5210459 |
11 | 23520746 |
12 | 106176061 |
13 | 479294501 |
14 | 2163605794 |
15 | 9766834956 |
16 | 44088930859 |
17 | 199023922776 |
18 | 898423280994 |
19 | 4055614926483 |
20 | 18307642707131 |
21 | 82643393810855 |
22 | 373064443621418 |
[7,31,135,616,2782,12544,56646,255699,1154239, 5210459,23520746,106176061,479294501,2163605794, 9766834956,44088930859,199023922776,898423280994, 4055614926483,18307642707131,82643393810855, 373064443621418] |