n | a(n) |
---|---|
3 | 1 |
4 | 4 |
5 | 16 |
6 | 53 |
7 | 173 |
8 | 532 |
9 | 1615 |
10 | 4785 |
11 | 14066 |
12 | 40908 |
13 | 118438 |
14 | 341253 |
15 | 981200 |
16 | 2815762 |
17 | 8075265 |
18 | 23149097 |
19 | 66373778 |
20 | 190376443 |
21 | 546401592 |
22 | 1569387414 |
23 | 4511532695 |
24 | 12980998062 |
25 | 37385342522 |
26 | 107771434819 |
27 | 310967929569 |
28 | 898108427259 |
29 | 2596180252466 |
30 | 7511411442182 |
[1,4,16,53,173,532,1615,4785,14066,40908,118438, 341253,981200,2815762,8075265,23149097,66373778, 190376443,546401592,1569387414,4511532695, 12980998062,37385342522,107771434819,310967929569, 898108427259,2596180252466,7511411442182] |