n | a(n) |
---|---|
1 | 2 |
2 | 9 |
3 | 28 |
4 | 121 |
5 | 336 |
6 | 1081 |
7 | 3060 |
8 | 8409 |
9 | 23527 |
10 | 64541 |
11 | 175198 |
12 | 480865 |
13 | 1304499 |
14 | 3523885 |
15 | 9557956 |
16 | 25874753 |
17 | 70115413 |
18 | 189961183 |
19 | 514272412 |
20 | 1394193581 |
21 | 3779849620 |
22 | 10246935645 |
23 | 27788566030 |
24 | 75370121161 |
25 | 204475052376 |
26 | 554805820453 |
27 | 1505578023622 |
28 | 4086199301997 |
[2,9,28,121,336,1081,3060,8409,23527,64541,175198, 480865,1304499,3523885,9557956,25874753,70115413, 189961183,514272412,1394193581,3779849620, 10246935645,27788566030,75370121161,204475052376, 554805820453,1505578023622,4086199301997] |