n | a(n) |
---|---|
0 | 1 |
1 | 7 |
2 | 31 |
3 | 139 |
4 | 607 |
5 | 2659 |
6 | 11623 |
7 | 50827 |
8 | 222223 |
9 | 971635 |
10 | 4248247 |
11 | 18574555 |
12 | 81213151 |
13 | 355086787 |
14 | 1552539271 |
15 | 6788138539 |
16 | 29679651247 |
17 | 129767784979 |
18 | 567381262423 |
19 | 2480750497147 |
20 | 10846539065983 |
21 | 47424120180835 |
[1,7,31,139,607,2659,11623,50827,222223,971635, 4248247,18574555,81213151,355086787,1552539271, 6788138539,29679651247,129767784979,567381262423, 2480750497147,10846539065983,47424120180835] |