n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 8 |
4 | 18 |
5 | 54 |
6 | 152 |
7 | 472 |
8 | 1410 |
9 | 4310 |
10 | 12952 |
11 | 39144 |
12 | 117554 |
13 | 353590 |
14 | 1061208 |
15 | 3186488 |
16 | 9560866 |
17 | 28691286 |
18 | 86078168 |
19 | 258260680 |
20 | 774795090 |
21 | 2324463926 |
22 | 6973431064 |
23 | 20920529304 |
24 | 62761705922 |
25 | 188285826262 |
26 | 564857832984 |
[1,3,8,18,54,152,472,1410,4310,12952,39144,117554, 353590,1061208,3186488,9560866,28691286,86078168, 258260680,774795090,2324463926,6973431064, 20920529304,62761705922,188285826262,564857832984] |