n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 27 |
4 | 78 |
5 | 228 |
6 | 666 |
7 | 1944 |
8 | 5676 |
9 | 16572 |
10 | 48384 |
11 | 141264 |
12 | 412440 |
13 | 1204176 |
14 | 3515760 |
15 | 10264752 |
16 | 29969376 |
17 | 87499776 |
18 | 255467808 |
19 | 745873920 |
20 | 2177683008 |
21 | 6358049472 |
22 | 18563212800 |
23 | 54197890560 |
24 | 158238305664 |
25 | 461998818048 |
26 | 1348870028544 |
27 | 3938214304512 |
[1,3,9,27,78,228,666,1944,5676,16572,48384,141264, 412440,1204176,3515760,10264752,29969376,87499776, 255467808,745873920,2177683008,6358049472, 18563212800,54197890560,158238305664,461998818048, 1348870028544,3938214304512] |