n | a(n) |
---|---|
3 | 1 |
4 | 4 |
5 | 14 |
6 | 44 |
7 | 133 |
8 | 392 |
9 | 1140 |
10 | 3288 |
11 | 9438 |
12 | 27016 |
13 | 77220 |
14 | 220584 |
15 | 630084 |
16 | 1800384 |
17 | 5147328 |
18 | 14727168 |
19 | 42171849 |
20 | 120870324 |
21 | 346757334 |
22 | 995742748 |
23 | 2862099185 |
24 | 8234447672 |
25 | 23713180780 |
26 | 68350541480 |
27 | 197188167735 |
28 | 569371325796 |
[1,4,14,44,133,392,1140,3288,9438,27016,77220, 220584,630084,1800384,5147328,14727168,42171849, 120870324,346757334,995742748,2862099185, 8234447672,23713180780,68350541480,197188167735, 569371325796] |