n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 6 |
3 | 17 |
4 | 30 |
5 | 177 |
6 | 417 |
7 | 1857 |
8 | 4302 |
9 | 19457 |
10 | 47731 |
11 | 203777 |
12 | 509769 |
13 | 2134017 |
14 | 5462701 |
15 | 22347777 |
16 | 58104062 |
17 | 234029057 |
18 | 616919457 |
19 | 2450784257 |
20 | 6533317815 |
21 | 25664946177 |
22 | 69085604341 |
23 | 268766806017 |
24 | 729558799305 |
25 | 2814562533377 |
[0,2,6,17,30,177,417,1857,4302,19457,47731,203777, 509769,2134017,5462701,22347777,58104062, 234029057,616919457,2450784257,6533317815, 25664946177,69085604341,268766806017,729558799305, 2814562533377] |