n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 18 |
4 | 54 |
5 | 162 |
6 | 486 |
7 | 1458 |
8 | 4374 |
9 | 13122 |
10 | 39366 |
11 | 118098 |
12 | 354294 |
13 | 1062882 |
14 | 3188646 |
15 | 9565938 |
16 | 28697814 |
17 | 86093442 |
18 | 258280326 |
19 | 774840978 |
20 | 2324522934 |
21 | 6973568802 |
22 | 20920706406 |
23 | 62762119218 |
24 | 188286357654 |
25 | 564859072962 |
26 | 1694577218886 |
27 | 5083731656658 |
28 | 15251194969974 |
[1,2,6,18,54,162,486,1458,4374,13122,39366,118098, 354294,1062882,3188646,9565938,28697814,86093442, 258280326,774840978,2324522934,6973568802, 20920706406,62762119218,188286357654,564859072962, 1694577218886,5083731656658,15251194969974] |