n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 37 |
5 | 111 |
6 | 333 |
7 | 1000 |
8 | 3001 |
9 | 9003 |
10 | 27009 |
11 | 81028 |
12 | 243084 |
13 | 729253 |
14 | 2187760 |
15 | 6563280 |
16 | 19689841 |
17 | 59069523 |
18 | 177208569 |
19 | 531625708 |
20 | 1594877124 |
21 | 4784631373 |
22 | 14353894120 |
23 | 43061682360 |
24 | 129185047080 |
25 | 387555141241 |
26 | 1162665423724 |
[0,1,4,12,37,111,333,1000,3001,9003,27009,81028, 243084,729253,2187760,6563280,19689841,59069523, 177208569,531625708,1594877124,4784631373, 14353894120,43061682360,129185047080,387555141241, 1162665423724] |