n | a(n) |
---|---|
0 | 2 |
1 | 7 |
2 | 23 |
3 | 72 |
4 | 218 |
5 | 648 |
6 | 1907 |
7 | 5581 |
8 | 16290 |
9 | 47502 |
10 | 138521 |
11 | 404183 |
12 | 1180402 |
13 | 3450899 |
14 | 10099605 |
15 | 29589780 |
16 | 86781374 |
17 | 254761882 |
18 | 748580729 |
19 | 2201465799 |
20 | 6479301022 |
21 | 19083705249 |
22 | 56246157177 |
23 | 165881453558 |
24 | 489506759446 |
[2,7,23,72,218,648,1907,5581,16290,47502,138521, 404183,1180402,3450899,10099605,29589780,86781374, 254761882,748580729,2201465799,6479301022, 19083705249,56246157177,165881453558,489506759446] |