n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 6 |
4 | 16 |
5 | 57 |
6 | 160 |
7 | 484 |
8 | 1449 |
9 | 4250 |
10 | 12736 |
11 | 37980 |
12 | 112684 |
13 | 335528 |
14 | 998929 |
15 | 2971856 |
16 | 8844112 |
17 | 26318889 |
18 | 78319204 |
19 | 233069764 |
20 | 693574740 |
21 | 2063954658 |
22 | 6142018600 |
23 | 18277651737 |
24 | 54391278960 |
25 | 161859683044 |
26 | 481668191001 |
27 | 1433366397054 |
[0,4,6,16,57,160,484,1449,4250,12736,37980,112684, 335528,998929,2971856,8844112,26318889,78319204, 233069764,693574740,2063954658,6142018600, 18277651737,54391278960,161859683044,481668191001, 1433366397054] |