n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 4 |
5 | 10 |
6 | 25 |
7 | 64 |
8 | 172 |
9 | 472 |
10 | 1319 |
11 | 3750 |
12 | 10796 |
13 | 31416 |
14 | 92276 |
15 | 273172 |
16 | 814246 |
17 | 2441688 |
18 | 7360877 |
19 | 22295746 |
20 | 67819576 |
21 | 207083944 |
22 | 634512581 |
23 | 1950301202 |
24 | 6011920720 |
25 | 18581123978 |
26 | 57568802820 |
27 | 178763375468 |
28 | 556255762692 |
29 | 1734248037856 |
[1,2,4,10,25,64,172,472,1319,3750,10796,31416, 92276,273172,814246,2441688,7360877,22295746, 67819576,207083944,634512581,1950301202, 6011920720,18581123978,57568802820,178763375468, 556255762692,1734248037856] |