n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 32 |
4 | 111 |
5 | 378 |
6 | 1287 |
7 | 4395 |
8 | 15012 |
9 | 51247 |
10 | 174930 |
11 | 597177 |
12 | 2038676 |
13 | 6959625 |
14 | 23758677 |
15 | 81107291 |
16 | 276883938 |
17 | 945225504 |
18 | 3226807479 |
19 | 11015664750 |
20 | 37605240819 |
21 | 128376648392 |
22 | 438251781660 |
23 | 1496102499171 |
24 | 5107389823160 |
25 | 17435590684584 |
26 | 59521562482293 |
[1,3,9,32,111,378,1287,4395,15012,51247,174930, 597177,2038676,6959625,23758677,81107291, 276883938,945225504,3226807479,11015664750, 37605240819,128376648392,438251781660, 1496102499171,5107389823160,17435590684584, 59521562482293] |