n | a(n) |
---|---|
4 | 1 |
5 | 3 |
6 | 9 |
7 | 31 |
8 | 105 |
9 | 352 |
10 | 1168 |
11 | 3828 |
12 | 12396 |
13 | 39698 |
14 | 125878 |
15 | 395686 |
16 | 1234426 |
17 | 3825911 |
18 | 11790893 |
19 | 36160491 |
20 | 110429221 |
21 | 336001043 |
22 | 1019092233 |
23 | 3082348295 |
24 | 9300339633 |
25 | 28002492673 |
26 | 84156758459 |
27 | 252507279805 |
28 | 756547966323 |
[1,3,9,31,105,352,1168,3828,12396,39698,125878, 395686,1234426,3825911,11790893,36160491, 110429221,336001043,1019092233,3082348295, 9300339633,28002492673,84156758459,252507279805, 756547966323] |